Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a209c998947abf…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 13:07:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d0bab33abb369bee247db41ad4043ebf SHA-1: 03a08601ae093f88beefd477d987b8e4bfa287d9 SHA-256: 38a209c998947abf54eb522d114849c8111ed8bfc5a6c4cd0ae7b9024b83aa91
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on domains that appear to be part of a link farm designed to distribute malicious content. The document body and extracted URLs suggest a lure for game cheats and hacks, a common tactic for distributing malware. The ML classifier also strongly indicated maliciousness.

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/roblox-cheat-farbe-game-hack
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-items-codes_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-rape-hack_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-not-fake-app_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-cheat-codes-free_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-roblox-hair_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-do-you-hack-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-cards-link_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-verification-2021-android_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-buy-pubg-uc-in-india_GM1330123889.pdf
    • http://elibrary.smknesbu.sch.id/repository/download-cheat-roblox-jailbreak-for-pc_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-android_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-spins-coin-master-without-survey_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/master-coin-free-link_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/robux-best_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/sb-game-hacker-coin-master_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/best-free-roblox-outfits_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-without-verification-or-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005241.bin
6e0da129f8cb26815c906939fc3677cf1082cdaca0b82ce4ce804bfa2255600f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5241 26000 bytes
font_01_sfnt_off00008d41.bin
07f8c622c54344fff6ffe4e1ed29182dc7cbe9723f3337c6e7eedfe6fa3e43a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D41 18448 bytes

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