Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20df4a7c8b3def2…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 19:19:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 280eeb04787051e7ef52901390e251dc SHA-1: 7915d49b4e01e7afd210711852f89a90b28b38cd SHA-256: b20df4a7c8b3def2603f02a519215694beb43a3c7f42cd064079e0454532bf9b
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are disguised as PDF files related to game cheats and hacks. The primary URL, http://netcdn.co/app/431946152/roblox-shinobi-story-cheat-script-game-hack, suggests the user is being directed to download a cheat script. The presence of a ML classifier flagging this PDF as malicious and the mass external link farm heuristic indicate a high likelihood of malicious intent, likely to deliver a second-stage payload.

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/roblox-shinobi-story-cheat-script-game-hack
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-date-and-time-hack_GM406889139.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/free-coin-master-spins-without-human-verification_GM406889139.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/robux-hack-no-human-verification_GM431946152.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-robux-fast-no-hack-2021_GM431946152.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-game-hack-link_GM406889139.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-tiktok-followers_GM835599320.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/coinmasterdailyfreespins-com_GM406889139.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/roblox-free-printables_GM431946152.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-online-hack-no-human-verification_GM406889139.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/2021-free-robux_GM431946152.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/working-coin-master-hack-2021_GM406889139.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/minecraft-tools_GM479516143.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/rxgate-cf-free-robux-redeem-code_GM431946152.pdf
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031c4.bin
69cd2ffea083e5f7383c2febde3c71ffb55c6306b555f76524a8f6e2f4c94d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31C4 22132 bytes
font_01_sfnt_off00006259.bin
abd08d4889bc6b8c973e16f24fdc4b2ba6e5e81ca8f4c263b4cc7c6cea2489c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6259 19232 bytes

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