It looks like you haven't done anything wrong with it.
But first, let us look into what you said as "copying data". When you said from trusted site then it could be meant as you were downloading it, right.? (give little more details).
If so, do you have any antivirus, firewall, additional security feature installed?
There are a lot of bad websites have their way try messing up with anyone by only single look harmless click. Any virus, adware, or malware might have its way into your system in that case.