So indicates Dolby Digital Plus with Atmos and 5.1 channels. This is the same audio you’d get on Disney+ for Thor (if your device supports Atmos). Legally, you can experience this via Disney+ or a 4K Blu-ray (which offers lossless TrueHD Atmos).
The filename signals an illegal copy, but the technical specs themselves are nothing special —they match what you get legally from Disney+ for $7.99/month (or less with an annual plan). Moreover, legal versions offer extras like bonus features, commentaries, and seamless integration with your TV or home theater. Thor.2011.1080p.DSNP.WEB-DL.DDPA.5.1.H.264-PiRa...