Malicious PDF — malware analysis report

Static analysis result for SHA-256 1621d5f34577bc18…

MALICIOUS

PDF

36.7 KB Created: 2021-05-20 13:03:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: baccf6b0f7af5c88f8e9e4997fd5adee SHA-1: 8a39f58a432f834e9425a21d8e410b849b475e94 SHA-256: 1621d5f34577bc189750fcf4266be813728c4267be94add8c2e1ac96004b3fd7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link. The embedded URL and other extracted URLs point to sites offering 'free Robux' or game hacks, which are common lures for malware. The ML classifier also flagged this PDF as malicious with high confidence. The document likely attempts to download a second-stage payload via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/free-robux-videos-game-hack
    • https://indo-parabola.com/ckfinder/userfiles/files/fbchampion-com_GM406889139.pdf
    • https://www.indo-parabola.com/ckfinder/userfiles/files/coin-master-spins-hack-iphone_GM406889139.pdf
    • https://indo-parabola.com/ckfinder/userfiles/files/minecraft-hacker-skin_GM479516143.pdf
    • https://www.indo-parabola.com/ckfinder/userfiles/files/como-hackear-coin-master-iphone_GM406889139.pdf
    • https://indo-parabola.com/ckfinder/userfiles/files/javascript-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000312c.bin
7c2e2cb22fcb1190663f0fda4957144e56a9dcc385f39767957f0712965c51c1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x312C 26748 bytes
font_01_sfnt_off00006d79.bin
1ec21ed17295e3d49cd7a507c4ef3ee968e538ae560c82d8bcc555326bed268a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D79 18444 bytes

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