Click Injection

Click injection is a sophisticated form of mobile ad fraud that targets app-install attribution. Unlike click fraud, which generates fake clicks to inflate metrics, click injection intercepts the install process itself. A malicious app on the user's device listens for Android install broadcasts and fires a fraudulent click milliseconds before the legitimate app finishes installing, stealing the attribution credit from the actual referring source.

In affiliate marketing, click injection directly impacts commission accuracy. When a fraudulent click overwrites the real affiliate's attribution, the operator pays commission to the wrong party. The legitimate affiliate who drove the user loses credit, and the fraudster earns undeserved CPA payouts. This makes click injection particularly damaging for programs using S2S tracking, because the fake click carries a valid click ID that appears legitimate in postback data.

Detecting click injection requires analyzing the time gap between click and install. Legitimate clicks typically show a distribution of delays ranging from seconds to hours, while injected clicks cluster within milliseconds of the install event. Operators can also compare click-to-install time (CTIT) distributions across traffic sources to identify anomalies. Advanced fraud detection systems flag sources where an unusually high percentage of installs occur within seconds of the attributed click.

For iGaming and forex operators running mobile acquisition campaigns, click injection can distort player acquisition cost calculations and misattribute high-value players to fraudulent affiliates. Implementing CTIT thresholds, validating referrer data, and using server-side install verification are essential countermeasures.