Malicious PDF — malware analysis report

Static analysis result for SHA-256 7090a3d35bf7d619…

MALICIOUS

PDF

36.4 KB Created: 2021-07-09 03:37:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6888c499670a6a9ed8ff601941f8ace7 SHA-1: acbc96d06acde48d6242abd63b6633dc289e348d SHA-256: 7090a3d35bf7d61915e946c6d38a0c4d1ca7358aebb4642ecd167eadedc9d565
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which appear to be part of an SEO link farm. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely to drive traffic to scam or malware-hosting sites. The document body, though garbled, contains references to game-related exploits and free items, suggesting a lure for users seeking such content.

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.tw/app/406889139/freespinandcoin-blogspot-game-hack
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdf
    • http://digilib.unbari.ac.id/repository/free-admin-in-roblox-games_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/cache-http-frtheperfectriacom-wirr-realfreerobuxcodeshtml_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/get-free-cards-in-coin-master_GM406889139.pdf
    • http://digilib.unbari.ac.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/minecraft-hacked-client_GM479516143.pdf
    • http://digilib.unbari.ac.id/repository/free-roblox-tablet_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/roblox-hack-generaort_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdf
    • http://digilib.unbari.ac.id/repository/i-think-ive-been-hacked-roblox_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/mobihack-net-roblox-hack_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/roblox-wild-west-guns-free-fe_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/how-to-get-a-tiger-free-shard-seekers-roblox_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdf
    • http://digilib.unbari.ac.id/repository/free-robux-sign_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/how-to-get-free-exotics-in-roblox-assassin-2021_GM431946152.pdf
    • http://digilib.unbari.ac.id/repository/how-to-make-t-shirts-for-free-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003676.bin
a89a1f35a98ce8b947f4e441a5095aa209396e4acc60a377fb6b4c5ced7a6465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3676 23112 bytes
font_01_sfnt_off00006a95.bin
2f07d9c8d148dde93075b89c8cd5cd53c46269e4de3f935f87338e36a9bad06d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A95 18636 bytes

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