Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4f33756970d1e5…

MALICIOUS

PDF

36.1 KB Created: 2021-06-26 00:30:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b1f1879d58b97e29cb2053c54b3613d4 SHA-1: 84978ed4428b62416300c4c1795182263e4d826d SHA-256: 6a4f33756970d1e5e964c18c80bf35ef3d386abbb55a5d673575461c63539157
102 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a lure for downloading potentially malicious files, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The document body and extracted URLs promote game hacks and cheats, suggesting a social engineering tactic to entice users to click on links that likely lead to malware. The ML classifier also strongly flagged this PDF as malicious.

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-roblox-survival-games-game-hack
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-free-clothes-hack_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/minecraft-hack-download_GM479516143.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-20210-robux-for-free_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/robuxzone-wordpress-com-free-robux_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/www-claim-gg-to-earn-free-robux_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-script-hack_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-game-hacking-tricks_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-minecraft-coins_GM479516143.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/hackers-on-roblox-that-will-give-me-free-robux_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-www-com_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/does-coin-master-hack-work_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/minecraft-bedrock-free-with-java_GM479516143.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-400-robux-generator-no-human-verification-or-offers_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-haktuts_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-free-robux-com_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/collect-free-spin-linms-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003338.bin
ba56c88611cfffbf909ce88f78a19efbaa5915bb3827428ea1a1971b3090970f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3338 23420 bytes
font_01_sfnt_off000067a3.bin
17a0b652423dd3c20498a598fcbb479e847689a0e3788569415421fa94ebb131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A3 19284 bytes

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