Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f7b1839ca92660…

MALICIOUS

PDF

44.5 KB Created: 2021-05-13 01:04:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4e1709d9e24ee1265bd284b4ca23d216 SHA-1: dde74ff9e2ccd3b2c47e0bc1adb24e9dcc580d7d SHA-256: 95f7b1839ca92660ce16a6f9660272cde785f3b872b51eb9d13833842c00edea
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised domains and appear to be part of a link farm. The document body, though partially corrupted, contains references to 'free Robux' and 'game hack', suggesting a lure for users interested in such topics. The ML classifier strongly indicated maliciousness, and the presence of many external links points towards a phishing or malware distribution attempt.

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 https://netcdn.xyz/app/431946152/blox.page-free-robux-game-hack
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/free-spin-coin-master-game_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021-ios_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/apps-to-get-free-robux_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/create-minecraft-server-free_GM479516143.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-using-cheat-engine_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/get-free-robux_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-game-ios_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-free-attack-hack_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/roblox-hacks-for-mac_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/roblox-com-free_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-for-kids_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b50.bin
be9b353800dd559e59e99a1bcfeb8829d40a5c374f1062b9886eafcffb9e5d83		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B50 26972 bytes
font_01_sfnt_off00008a27.bin
477bf2ef93abdd264292ffad6df1a1b97b65e35661cdcc3b49278aa82d19b07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A27 18848 bytes

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