Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be64f76b51fe2b…

MALICIOUS

PDF

44.4 KB Created: 2021-05-17 03:05:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 926a6dfeadd49a39545ddb49300cfb19 SHA-1: 392eccbd4b3fe2e9e5da5e768d5ea6366fe9f5e8 SHA-256: f8be64f76b51fe2bb68886236519750599a0a198f98c0dc2416358574429354b
142 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a fake CAPTCHA to trick users into interacting with malicious links. The document contains a large number of external links, many pointing to PDF files hosted on similar domains, suggesting a link farm designed to distribute potentially harmful content or lead users to scam pages. No scripts were extracted, but the presence of embedded URLs and the fake CAPTCHA heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/how-to-get-free-spins-in-coin-master-game-hack
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-apk-no-fb-login_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-coins-coin-master-blog_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-no-verification-required_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-rewards-link_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/is-minecraft-free-on-xbox_GM479516143.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-shirt-roblox_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-kid-friendly_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/descargar-hack-coin-master_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-robux-safe_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-coin-master-coins_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-apk-free-download_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/master-hack-coin_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/free-draw-2-roblox_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/coin-master-firebird-card-free_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/smart-lodhi-coin-master-hack_GM406889139.pdf
    • https://nedowningbrochure.co.uk/admin/ckfinder/userfiles/files/get-free-cards-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a58.bin
3de786cbd705b110322e9c1e9eb7a0339fa90e523cb046c98b442b4db61aaa8e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A58 24424 bytes
font_01_sfnt_off00008206.bin
381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8206 2824 bytes
font_02_sfnt_off00008ba9.bin
52b27d49d658c5dd219fe1685a79a71966a386845fdc62a41335e5719e4d5001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA9 18052 bytes

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