Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf572829d393605…

MALICIOUS

PDF

34.1 KB Created: 2021-06-29 12:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 34d68f06cb1729bab0719bde0cee6da3 SHA-1: 13f3dbff9b4ce0d91eb45438131a9a8add3db6a5 SHA-256: bbf572829d393605ee3a7f81fc9e2c03a5702d16c8dc3f217fdd57f7aaebc182
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that promotes free game cheats and currency, indicative of a phishing or scam lure. The heuristic PDF_SEO_LINK_FARM firing suggests a large number of external links were generated, likely to distribute malicious content or redirect users to scam sites. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this PDF.

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 http://netcdn.co/app/431946152/free-h-robux-game-game-hack PDF link annotation
    • https://admin.9credit.vn/data/files/how-to-cheat-in-growing-up-simulator-in-roblox_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-i-can-play-for-free_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/su-tart-sad-story-free-mod-roblox_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-get-free-robux-place_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/bad-business-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-minecraft-mods-for-pc_GM479516143.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_off00002dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DBB 22712 bytes
SHA-256: 8a891509c313bf5715be93503ccccf65b6f7a9728ec01febcea3011e4a1e6e70
font_01_sfnt_off0000605a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605A 18976 bytes
SHA-256: 0f365030770f84b1b95ca11ff24f5ae3230e3c4c735f6dbe0df84cbce3a40aee

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