Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab97ec18aafeaca…

MALICIOUS

PDF

34.5 KB Created: 2021-06-25 22:45:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 891968b3c325a98e7d6192225c19637a SHA-1: a77af17a11395ac28af9f3c8f015ad3d08497cf5 SHA-256: 0ab97ec18aafeaca02e6b569401ca75b7e29ad2eb2f602947c0e8b3a380fdf6a
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external sites, many of which are presented as lures for free game currency or hacks. The presence of a fake CAPTCHA heuristic indicates a deceptive user interface designed to trick the user into clicking links or performing actions that lead to further compromise. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is part of a phishing or scam campaign.

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.
  • 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 http://netcdn.co/app/431946152/legit-robux-free-game-hack
    • https://vireco.store/ckfinder/userfiles/files/card-hack-for-coin-master_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-coin-master-spins-daily_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/new-roblox-logo-gives-free-robux-robuxian_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-hack-into-anyones-roblox-account-2021-june_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/www-robux_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/spin-and-coin-link_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-coins-coin-master-ios_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/best-free-roblox-outfits_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/coin-master-hack-dot-xyz_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-roblox-songs-mp3_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.pdf
    • https://vireco.store/ckfinder/userfiles/files/roblox-free-hair-boy_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/roblox-free-robux-download_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/minecraft-windows-10-edition-free_GM479516143.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-hack-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003159.bin
227b9ad5357ad5d453ee15e15bd5b9cf95364a52aa92de5ee6d6aac1d1d8ae03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3159 22212 bytes
font_01_sfnt_off000061e6.bin
2f19705a2144d8f8a634d9df6035c5c76d93d02d2bcd5d9cbddd6f961e05b934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 18940 bytes

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