This challenge is part of the misc category:

freya
Misc (200 pts)
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We've traveled back far, but this protocol looks familiar...
Our reconnaissance team did a great job, they got us a data capture
from the currently running systems and a private key
from the server (shell.woo.pctf which resolves to 54.226.73.167).
Take  a look at the traffic our reconnaissance team picked up, and see if you
can get access to The Plague's server, at 54.226.73.167.

with the following four files:

• freya.pcapng
• freya_cert.pem
• freya_priv.pem
• password

The task is pretty simple - somehow get access to shell.woo.pctf, probably by using ssh.