The quick response is you can’t, you are running an executable someone else had to modify.
The long answer is trust, find a bigger warez group like fitgirl, codex etc. Though I am afraid not many of them focus on software other then games. If these groups malw’d their cracks it would destroy their reputation.
For searching, obviously older, dedicated private trackers are often better and in a way safer, though I don’t know any specific to programs, like Ableton or others.