Downloading a modded APK is not a crime, but you're probably putting your phone at risk. Some apps are malwares, others steal money by making your phone pay for premium apps. So just be careful, don't install apps that do not have an icon.
The Flesh Mask: This is a new death trap in Saw X that is particularly gruesome. The victim is forced to wear a mask made of their own flesh. The mask slowly tightens, suffocating the victim.