Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd445ff3c6efb6e…

MALICIOUS

PDF

42.3 KB Created: 2021-05-17 18:00:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 92b9040053200d873aeed464ef85699c SHA-1: 5e4c4a0b95aa2c483bea32bae824b042b1772738 SHA-256: 5fd445ff3c6efb6e2d87443d54ec5fb57b50ccb9e5cd7fc7c9cb86b87115bc72
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are related to game hacks and free items, suggesting a lure for users to click through to potentially malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and the ML_NYX_PDF_MALICIOUS model strongly flags it as malicious. The embedded URLs and the document body's content point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/free-coins-coin-master-game-hack
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-apk-no-fb-login_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/grab-points-login_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/daily-free-spin-link-in-coin-master_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/what-is-robux_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/download-coin-master-hack_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/hack-coin-master-apk-mod_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/can-i-get-free-robux_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/best-minecraft-hacked-client-2021_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-master_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/info-roblox-com-robux_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/roblox-zone-free-robux_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-tool-generator_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c4b.bin
99e2c40905d31cec767b37e5e0b3243beb3f7068ed860102ac7b4624d3f75432		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C4B 24604 bytes
font_01_sfnt_off000084d6.bin
fd51fa1b849cf95139b510f282bcd47e41e352499df1938c7ca947a320e7b070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D6 17712 bytes

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