Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c411366e3d2382…

MALICIOUS

PDF

35.4 KB Created: 2021-07-01 17:06:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6f264b48cb397ee516a43a075d5587ee SHA-1: e445d3cad2042e71ad79a295d76ef1bfb6a27bf5 SHA-256: 31c411366e3d23825a0c9011927d2a468cd40ccbed2a0f52be283bf03517d45d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs that form a link farm, primarily promoting 'free Robux' and game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links designed to attract users. The ML classifier also flagged the document as malicious with high confidence. The primary attack pattern involves luring users to download further content via these links.

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.robux.demo-game-hack
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-june-2021_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-passwords_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-get-coin-master-free-spin-link_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/pokemon-go-free-64-bit_GM1094591345.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/minecraft-free-download-2021_GM479516143.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-spin-pattern_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-get-free-minecraft-coins_GM479516143.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/best-free-roblox-executor_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-haktuts_GM406889139.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/codes-how-to-get-free-robux_GM431946152.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/robux-best_GM431946152.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • https://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/i-want-free-robux_GM431946152.pdf
    • http://elearning.mtsn1banjarnegara.sch.id/__statics/gudangsoal/files/www-robux-com_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003118.bin
af4c87d1169d05d0c55066e715f7a30b229223f84b0c967c1c04f6c902c85545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3118 23036 bytes
font_01_sfnt_off000064d2.bin
8631d6d323f913aaff6f155431900394b238934bf0fd7fbc3d83e637f4afd868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 19216 bytes

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