Malicious PDF — malware analysis report

Static analysis result for SHA-256 77367954a0741376…

MALICIOUS

PDF

51.6 KB Created: 2021-06-03 04:04:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 77faba6ed9f6acd99dba2537dc8bb8cf SHA-1: ac8bcbb26eb4b62673add7d09613e201b38a8bcb SHA-256: 77367954a0741376949356852c02a412bb7170091999c56d14c3e77b3f34055b
142 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to deceive users into interacting with embedded links. The document contains a mass of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or content-generation scheme. The primary external URL, https://netcdn.online/app/431946152/roblox-shirt-template-free-game-hack, is likely the ultimate destination for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/431946152/roblox-shirt-template-free-game-hack
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/legit-free-spins-coin-master_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-font-free_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/can-you-get-free-robux-on-roblox_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/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-roblox-gift-card_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/minecraft-logo-maker-free_GM479516143.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/rake-roblox-health-bar-hack_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-mod-apk-hack_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-earn-free-robux_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-minecraft-maps-pe_GM479516143.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-points_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/coin-master-200-spin-link_GM406889139.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/free-ways-to-get-robux_GM431946152.pdf
    • http://kpu-badungkab.go.id/new/public/ckfinder/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055e7.bin
237b2e7b0cee658c7c9d7815d7b2d7628abf3a931091537e53741ee77d45c65a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55E7 29188 bytes
font_01_sfnt_off00009870.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9870 5696 bytes
font_02_sfnt_off0000a581.bin
d6f805bdffd03661be01a04ac852086d1abcf91b3aa9c1742de675ba95b2394a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA581 19000 bytes

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