This is a very scary trap because I know a lot of people who knows how to download from bittorrent but don't know anything about peer, leecher, tracker and etc... In short, they don't know how bittorrent works but they know that by waiting for days, the download will complete and they get what they want.
Here's how you can know if the Torrent or Tracker is fake.
Fenopy has created a Fake Finder page that lists the most popular fake torrents and the latest fake trackers. It also allows you to search for fake torrents by keyword or infohash.
Code:

I took a look at the whole list of all fake torrents and the
filename looks pretty real. There's no way you can know
whether the torrent is fake or not unless it's listed on
Fenopy Fake Finder list.
If you're using uTorrent, here's how to check which tracker
are you connecting to.

After loading torrent file to your bittorrent client, look
at the "General" tab and you'll see "Tracker URL".
If the tracker URL is listed on Fenopy Fake Finder, please,
don't even start downloading it!
I didn't write the tutorial, greetz to writer