Malicious PDF — malware analysis report

Static analysis result for SHA-256 833e8a556d5a47a7…

MALICIOUS

PDF

34.9 KB Created: 2021-07-07 11:19:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 01cdd59c388764865083491c0683836b SHA-1: 7b3ecfc50962bf44138f79a68e3a5b4e136ff2e1 SHA-256: 833e8a556d5a47a720f25dd11c0a8c8b3aba268451f46bc9af696bb2c7f62a49
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites that promise free in-game items and hacks, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports this assessment. The document's content and structure suggest it is designed to trick users into visiting potentially harmful sites.

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.tw/app/406889139/free-coin-master-links-game-hack
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-without-offers_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-real_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/where-to-get-free-robux_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/minecraft-dungeons-free-download-pc_GM479516143.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-working-hack_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-hacks-online-no-download_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-cheat-in-roblox-get-eaten_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-games_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/moonactive-coin-master-free-spins_GM406889139.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/roblox-hack-robux-2021_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/i-just-got-free-robux-from-roblox_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-administrator-badge-hack-2021_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-roblox-selena-quintanilla_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-items-on-roblox-no-pastebin_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003271.bin
fda7dc51a593d55152488860dffbc7d00aebb393589d69d8e433e816a8596c05		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3271 22924 bytes
font_01_sfnt_off00006625.bin
8de0148014db431be508c837079dea1fd88eb4d3bf9aad0e575fcfb6a46af486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6625 18168 bytes

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