Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9254fe3d9d51c5…

MALICIOUS

PDF

44.9 KB Created: 2021-06-10 21:09:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c1e14c57d45ff7855974ea1ceef7c5a1 SHA-1: 0ab3dc9d32f60b20d19dacd6d566dea37b23faa3 SHA-256: 2b9254fe3d9d51c52e5a77760f26af07b696d14d63d4a57f5a403db9a244b3d7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a call-to-action phrase, directing users to websites that promise in-game currency. The ML classifier and PDF link farm heuristics strongly indicate malicious intent, likely to trick users into visiting scam or phishing sites. No scripts were extracted, but the presence of external URIs and the link farm suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/get-free-robux-eu5-game-hack PDF link annotation
    • http://armportal.co.uk/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/probability-that-the-new-roblox-item-will-be-free_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/kid-cheating-on-roblox-girlfriend_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50D7 26576 bytes
SHA-256: ffa0239eda27e65ed7e5b31a4da91a5adce69ba92a8154f7406517288486a3bd
font_01_sfnt_off00008cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD1 18252 bytes
SHA-256: b7281d84b5eb7386c4aa68fbe34d5c63a87c9f087f1c85da66fb7a8fbb6bd156

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