Malicious PDF — malware analysis report

Static analysis result for SHA-256 da26e6e9c670c16c…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 23:21:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 02d40d332e0bddea6b531fbc6477c5cc SHA-1: e807a80c9012b90f364095fa9d8be406ee4f1097 SHA-256: da26e6e9c670c16ce477d6093c7d18f706f12646305d4e263d253604234ede65
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links disguised as download opportunities for in-game items and currency, a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic suggests a deliberate attempt to manipulate search engine results or direct users to potentially malicious sites. The document body itself contains URLs that are likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/coin-master-free-spins-daily-fb-champion-game-hack
    • http://digilib-pps.unja.ac.id/repository/roblox-skins-boy-free_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/roblox-strucid-free-private-server-join_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/impact-hack-roblox-download_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/how-to-hack-any-account-on-roblox-2021_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdf
    • http://digilib-pps.unja.ac.id/repository/bingo-free-robux_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/roblox-tix-generator_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/how-to-hack-coin-master-in-pc_GM406889139.pdf
    • http://digilib-pps.unja.ac.id/repository/how-to-hack-roblox-passwords-with-cmd_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/roblox-group-free-robux_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/coin-master-spins-gratis_GM406889139.pdf
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://digilib-pps.unja.ac.id/repository/fast-and-easy-way-to-get-free-robux_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/free-roblox-pokemon_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdf
    • http://digilib-pps.unja.ac.id/repository/offers-for-robux_GM431946152.pdf
    • http://digilib-pps.unja.ac.id/repository/roblox-project-lazarus-zombies-hack-script_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003245.bin
74e87edf0c1012bfec947b7a5cd5e1251634ef82e30356194c0e2ab2d3ce42a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3245 23064 bytes
font_01_sfnt_off00006632.bin
51e8a71e09394fed5f421e653934fdd3595df511c0ce3b30553a7297a7ed1ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 19180 bytes

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