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The CTF also includes a chance to apply techniques against white-box crypto. For this you are given a Linux binary, where the secret key is somehow encoded inside this binary! Extract the AES-128 key for victory.
Looking for some white-box crypto background? As a starter you might check out the paper [https://eprint.iacr.org/2015/753.pdf Differential Computation Analysis: Hiding your White-Box Designs is Not Enough] by Joppe W. Bos, Charles Hubain, Wil Michiels, and Philippe Teuwen.
This paper has an associated series of tools & examples you can access at https://github.com/SideChannelMarvels - hopefully this gets you started in white-box analysis.