My files become corrupted after downloading?

[Jomsss]

I tried to download one mp3 file, then after downloading it was fine until after 10 seconds or so, it became corrupted. It also crashed my Music app when I tried to open it there. I tried to download other files like APKs and the results was the same. I started to think that my phone has virus or malware. Anyone can help me out here?
I am using a STARMOBILE SKY phone with 4.4 KitKat Version

 

[B. Diddy]

Welcome to Android Central! Are you downloading these files to Internal Storage or an SD card? What sites are you downloading these files from? If these are music files from a "free" music download site, for music that you would normally have to pay for, then there's a fairly high risk of malware. The same goes for apk files, especially if it's a site that offers "free" apps and games that you normally have to pay for.

Since malware is a significant concern, delete all of those files you downloaded and run a good antivirus app, like Malwarebytes. But keep in mind that negative scans don't rule out malware.