Malicious PDF — malware analysis report

Static analysis result for SHA-256 82726d338a703d9f…

MALICIOUS

PDF

33.5 KB Created: 2021-07-09 16:00:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9e965d911f9ad4dfd33a75734b4c5ca3 SHA-1: 2e3356a663f26cfd457c5a742f7cb70161bd0347 SHA-256: 82726d338a703d9f51a5541e90d3b9aa90e6407bd9e2c81eb17ad1c89fc21aea
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, strongly suggesting a phishing or scam attempt. The ML classifier and PDF link farm heuristic indicate malicious intent, likely to redirect users to sites offering fake in-game currency or other fraudulent content. No scripts were extracted, but the overall structure and content point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.tw/app/431946152/can-you-get-robux-for-free-game-hack
    • https://www.yatrikathmandusuite.com/userfiles/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/claim-free-spins-coin-master_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/robux-gift-card-free_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/can-you-get-robux-for-free_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/robux-in_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/oprewards-points-generator_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/unlimited-coin-master-free-spins_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-find-coin-master-free-spin-link_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-game-free-spin_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/is-roblox-free-on-xbox_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-coin-master-spins-2021_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/free-spins-coin-master-2021-app_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-admin-in-roblox_GM431946152.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdf
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002bc6.bin
17a5c61add81d113b186703b6d8d5d687dba1b73ae59199116938118d299188e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC6 22688 bytes
font_01_sfnt_off00005e63.bin
2c6f447800a96913986af3bd62aa8a594d802346a7a39b4742ef2d084cdb3097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E63 18984 bytes

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