1. Just open the .pcapng file and start analyzing.
2. Sort requests for "Info".
3. Watch requests "URB_INTERRUPT in" and only from 7.16.1 to Host. If you open a request and scroll down you can see Array: <value>. Like that:
"""Array: 30
"""0011 0000 = Usage: Keyboard ] and } (0x0007, 0x0030)
Just open all requests and write symbols in txt. And you get the flag.

Flag: VishwaCTF{n0w_y0u_423_d0n3_w17h_u58_f023n51c5}.