Sure. Sorry for the late response! It is basically maintained by a reputable source (android police) and they also seem to take security seriously. If they cannot verify the origin of an APK for sure, they rather reject it.

http://www.androidpolice.com/2014/11/19/meet-apk-mirror/

https://www.apkmirror.com/faq/#What_measures_do_you_take_to_...