Malicious PDF — malware analysis report

Static analysis result for SHA-256 811c625847e71ea8…

MALICIOUS

PDF

36.9 KB Created: 2021-05-21 15:41:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 66b8552621675e5b9d250f0928ff92e1 SHA-1: 2ee51f82f208437c950c37f6f72301821f73bc59 SHA-256: 811c625847e71ea896e99be617b3d5e67fa0c707b62cb5ed016f9db32ffcc4e1
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and an embedded URI pointing to a URL associated with 'free robux hack'. This suggests a social engineering attack aimed at tricking users into downloading a malicious payload or visiting a phishing site. The presence of multiple suspicious URLs further supports this assessment.

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-hack-2021-game-hack
    • http://selectionspdf.fr/images/free-coin-master-gifts_GM406889139.pdf
    • http://selectionspdf.fr/images/coin-master-card-hack-apk_GM406889139.pdf
    • http://selectionspdf.fr/images/can-i-play-roblox-for-free_GM431946152.pdf
    • http://selectionspdf.fr/images/minecraft-apk-download-free-11-055_GM479516143.pdf
    • http://selectionspdf.fr/images/hack-my-game-xyz-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003214.bin
3a3cff00c842e0d373bcbb70ba2f59e87ca8623349f7633758d54afc3d174db6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3214 26008 bytes
font_01_sfnt_off00006d69.bin
b2e74e066e927f416452387fe7118a02e4882588ce64a473b0bf6318b488dee0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D69 18816 bytes

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