Banana Smoothie - 349
steg - BYUCTF
Challenge description:
I found this flag on the CTF admin’s computer, so I figured I’d just give it to you. The only problem is that it’s not opening for me…
Download file: flag.png
Solution
We are given an image. However, trying to open it doesn’t work, as we get an error message saying its not an image file.
Running the file command tells us its just ASCII text, so I looked at the top of the file with less to understand what it was.
# This file uses centimeters as units for non-parametric coordinates.
mtllib byu2.mtl
g default
v 58.987507 100.245819 0.000000
v 58.975491 100.253433 0.000000
v 58.942921 100.276283 0.000000
v 58.895039 100.314445 0.000000
v 58.837074 100.367950 0.000000
v 58.805000 100.398651 0.000000
v 58.768661 100.430710 0.000000
v 58.729481 100.465256 0.000000
v 58.688873 100.503433 0.000000
v 58.837074 100.123642 0.000000
v 58.932156 99.866028 0.000000
v 63.334499 106.648544 0.011159
...
Googling mtllib .mtl, I found its characteristic of .obj files. I converted the file extension to .obj and went on the hunt for a 3d file viewer. Trying a few different ones, I found this one with the option to view as wireframe.
This allows you to look inside the 3d model, where the flag is hidden.
