$ head -c 8 QfUhZZXf | hexdump -C 00000000 89 50 4e 47 0d 0a 1a 0a |.PNG....| The file is a that also contains additional data (likely steganography or an embedded archive). 5. Extracting Hidden Data from the PNG 5.1. Visual Inspection $ display QfUhZZXf # (or any image viewer) The image is a simple abstract pattern – nothing obvious. 5.2. Metadata & Chunk Analysis PNG files can embed arbitrary data in ancillary chunks (e.g., tEXt , zTXt , iTXt , eXIf ). Use pngcheck :
<form method="GET" action="download.php"> <input type="text" name="file" placeholder="File name"> <input type="submit" value="Download"> </form> The parameter is file . Testing with some basic values: https- ranoz.gg file QfUhZZXf
$ 7z l secret_payload ... 0 0 0 0 0 -rw-r--r-- 0 0 secret.txt Extract: $ head -c 8 QfUhZZXf | hexdump -C
$ curl "https://ranoz.gg/download.php?file=download.php%3fsource" No luck. Visual Inspection $ display QfUhZZXf # (or any
$ gobuster dir -u https://ranoz.gg/ -w /usr/share/wordlists/dirb/common.txt -x .bak,.old,.php~ -t 50 Result: download.php.bak returned a 2 kB file. <?php // Simple file downloader – DO NOT expose to the public! $allowed = ['QfUhZZXf', 'public.txt', 'welcome.html']; if (isset($_GET['file'])) $file = basename($_GET['file']); if (in_array($file, $allowed)) $path = __DIR__ . "/files/" . $file; if (file_exists($path)) header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="'.$file.'"'); readfile($path); exit;
Run binwalk and strings for deeper insight: