Downloading a "Mod APK" (modified Android Package) from unofficial sources carries significant security risks:
Many "free" mods replace original ads with even more intrusive ones that run in the background, ironically draining the battery the app is meant to save. killapps-pro-close-all-apps-running-mod-apk
Here is a report on the risks and functionality associated with such files: Downloading a "Mod APK" (modified Android Package) from