Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf447f1836f78d7…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 18:36:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fcc2af51a530ed20633aeec3b2ddc512 SHA-1: ac32e0b291676f99cd1ecbd32af8300d77435460 SHA-256: cbf447f1836f78d7a0387f599ec8e6db02a81b7ea595cd70a38ed9c078bd4e0b
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are part of a link farm designed to appear as legitimate content. The document body, though heavily obfuscated, contains references to game hacks and free currency, suggesting a lure for users to click on the malicious URLs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/479516143/minecraft-bedrock-free-game-hack
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-apk-free-download_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/free-hacks-for-coin-master_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coinmaster-blogspot_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-fb-free-spins-link_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/www-free-robux_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/roblox-studio-free-robux_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-cheat_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/free-minecraft-codes_GM479516143.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/smart-lodhi-coin-master-hack_GM406889139.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/free-robux-now_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdf
    • https://www.hagleygolfclub.co.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://www.freenom.comHey
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005858.bin
4b020d8d0bafbd7ec2f7895d35c306133e30e0246c763b932205bc1925bfd86c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5858 25236 bytes
font_01_sfnt_off000090e6.bin
421dc37018d5e6f1467ffbccbacebf5894202cb157ac672e86022266516fa266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E6 18268 bytes

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