Pop-ups say your Android device is infected with a Trojan. Android Armor is an antivirus app with some bad press regarding shady detection methods. Even a deep or SD card scan would find nothing as theres no malware on the phone. This could be a case of an overzealous advertiser who gets paid each time the app is installed, but this isnt standard practice for legitimate software. The company gets you to install their app and you get a false sense of security.”]
Source: https://blog.malwarebytes.com/cybercrime/2013/12/android-pop-ups-warn-of-infection/