Glossary
What is mobile ad fraud?
Mobile ad fraud is any deliberate activity that manipulates advertising data — through bots, click injection, SDK spoofing or device farms — in order to steal ad spend or distort campaign metrics.
The two families
Almost all ad fraud falls into one of two categories, and the distinction matters because they are detected differently.
Fabrication. Inventing activity that never happened — fake installs, bots, SDK spoofing. The advertiser pays for users who do not exist.
Attribution theft. Real activity, stolen credit. Click spam and click injection claim organic installs that would have happened anyway. The user is real; the payment is not earned.
The second is more insidious, because the cohort behaves normally in every downstream metric. Retention looks fine, revenue looks fine, and the money was still wasted.
How detection works
- Timing distributions. Click to install time has a characteristic shape; fraud distorts it in recognisable ways.
- Device and network signals. Emulators, data-centre IP ranges, impossible device configurations.
- Behavioural anomalies. Perfect regularity, absent variance, event sequences no human produces.
- Downstream outcomes. Sources with normal installs and near-zero retention.
- Cross-source patterns, which is why an MMP seeing every source detects more than any single network can.
What actually reduces it
Detection tooling helps and is not the main lever. The main lever is removing the economic incentive.
Buy on outcomes deep enough that faking them costs more than the payout. Insist on sub-publisher transparency and blocklist aggressively. Agree a clawback process before launch rather than after a dispute. And judge every source on retention and revenue rather than on installs, because fabricated users cannot fake a downstream cohort.
Fraud concentrates where oversight is thinnest and payouts are shallow. Changing those two conditions moves more than any detection vendor.
Fraud on AI surfaces
The current formats are structurally less exposed to the classic patterns. There is no install to fabricate, no click required for value, and inventory is gated by publisher eligibility rules rather than open to any supply source that wants to join.
The exposure that does exist is different in kind: manufactured conversational traffic to inflate a publisher's apparent inventory, and manipulation of the signals that describe intent. Both are supply-side integrity problems rather than click-level fraud, and both are best addressed by knowing which publishers you are actually buying.
Common questions
What proportion of mobile ad spend is lost to fraud?
Published estimates vary enormously depending on definition and methodology, and the honest answer is that nobody knows precisely. The useful number is your own: measure retention by source and the gap becomes visible.
Does buying on CPA eliminate fraud risk?
It raises the cost of faking, which reduces it. It also concentrates the incentive on faking the specific action you pay for, so deep and verifiable action definitions matter more under CPA than under CPI.
More in fraud and validation
How invalid traffic is manufactured, and how it is caught.