Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd63192c45c95e0d…

MALICIOUS

PDF

45.1 KB Created: 2021-05-13 17:02:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3fa454ed0eecb3d274d33f69efb8be43 SHA-1: 8beb28d749792acec1c2026eb18acd3d76414591 SHA-256: bd63192c45c95e0d94ea0842b06b0387c603d47b2ae32c634aac128da7b544e2
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 external websites that promise free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm designed to attract users through deceptive content. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.xyz/app/431946152/how-to-get-free-robux-2021-game-hack
    • https://www.poc-helmet.com/ckfinder/userfiles/files/hack-coin-master-free-spins_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/how-to-get-robux-easy_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-free-spins-link-whatsapp-group_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/roblox40com-robux_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/give-me-robux-now_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-admin-free-spins_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-link_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-robux-groups-2021_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-hack-unlimited-spins_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/roblox-hacked-version-download_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/free-robux-gift-card-generator_GM431946152.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/coin-master-free-spin-sites_GM406889139.pdf
    • https://www.poc-helmet.com/ckfinder/userfiles/files/to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049ec.bin
a190850e114c090bf2fbe7df6307def1ede7ee1ab0b524f177e128011d3077bb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49EC 29748 bytes
font_01_sfnt_off00008ce1.bin
662354714a7c4aa127b8bd681013e9d5d113fbfc5a2f5afb2d34764175bb04a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE1 18684 bytes

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