Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55aefc56560372d…

MALICIOUS

PDF

34.5 KB Created: 2021-06-20 22:05:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 173474666e3f26ec04c9a3b93c18a33d SHA-1: 6ae849e9f96a560e54d9c76b65df676406043401 SHA-256: a55aefc56560372dc4c1fa278b1715565c0108a576bee3ec8b17b27587bc79e1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous links to external PDFs, many of which are SEO-optimized with keywords related to game hacks and free currency, such as 'roblox-password-hack-website-game-hack'. The ML classifier strongly flagged this PDF as malicious, and the presence of a mass external link farm suggests a phishing or malware distribution scheme. The document body itself contains similar lures and URLs, reinforcing the intent to direct users to potentially harmful content.

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 http://netcdn.co/app/431946152/roblox-password-hack-website-game-hack
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-boombox-roblox-gear_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/robux-hack-real-no-survey_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-no-verify_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-free-robux-website_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/godzilla-roblox-free-items_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/earn-free-spins-for-coin-master_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/minecraft-maps-pe-free-download_GM479516143.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-gift-cards_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-hack-coin-master-using-es-filer_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-hack-100-working_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/claim-free-robux_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-hack-without-verification_GM406889139.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-roblox-clothes-for-your-avatar_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-com-roblox_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/blox-world-free-robux_GM431946152.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f36.bin
87e34d5f38b6e6dc1f443cb6ac68eaf04bafab9249b2175d7e0511a990f569bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F36 22140 bytes
font_01_sfnt_off00006015.bin
089032d6d7c1ceb786268fcf369cb52bcff95e6cedfa17c4aad4799eb7dc6b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 19572 bytes

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