Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3096552357bf147…

MALICIOUS

PDF

35.9 KB Created: 2021-05-22 20:58:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 75da096186a8961eddf247db75739c27 SHA-1: 0519e8bc8517938929157233a1d27eaf717f45ea SHA-256: a3096552357bf147c24a8cfee441f57ff64cd3990f30836be9d8aeb0e651bc0b
82 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating a browser installation lure and a visual download button, suggesting a social engineering attack. The embedded URL and document body text promote free items for games like TikTok and Roblox, aiming to trick users into clicking malicious links. While no scripts were directly extracted, the ML classifier flagged the PDF as malicious with high confidence, and the presence of external URIs points to a likely download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 4

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-tiktok-likes-and-followers-game-hack
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-spins_GM406889139.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-xyz_GM406889139.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdf
    • http://www.mucinvitinh.vn/public/images/image_uploads/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003194.bin
500dd0e71a48b13f461f4e9af46d680cd16129976c1d5a432179edf536afd4de		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3194 25832 bytes
font_01_sfnt_off00006c1c.bin
d80a5b590fc1f536f9a9d288da246cac59e10184b672ed9828d0991e5480315e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1C 17868 bytes

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