This is a simple steganography challenge, this was easily solved by running the standard stego tools.
We are given a PNG image of a tractor.
Nothing visually stands out in the image so we can run strings on it. We can then use grep to search for the flag as we know that the flag format is pactf{...}.
strings trailer.jpg | grep pactf
We get nothing, is there a file hidden inside the image?
binwalk -e trailer.jpg
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
0 0x0 JPEG image data, JFIF standard 1.01
30 0x1E TIFF image data, big-endian, offset of first image directory: 8
16915 0x4213 PNG image, 960 x 640, 8-bit/color RGB, non-interlaced
17042 0x4292 Zlib compressed data, compressed
It has found an image, this can also be done with foremost.
foremost trailer.jpg
Processing: trailer.jpg
|*|
If we open the extracted image, we can see the flag.
Flag: pactf{tr41lEr.p4rk}