Malicious PDF — malware analysis report

Static analysis result for SHA-256 1778762397b9e6ec…

MALICIOUS

PDF

32.0 KB Created: 2021-06-21 16:18:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 02fc5d7749b6916140be4f1a61e366a2 SHA-1: 6afd414de32df3bcb00842686ec7f28507811c63 SHA-256: 1778762397b9e6ece25fabf15b202ef73594b80b1771dd3ff9b797a42d8458c8
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a document body that promotes "hacks" for popular games, aiming to trick users into clicking malicious links. The presence of a PDF link farm heuristic and ML classification strongly indicates malicious intent, likely to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/hack-para-obtener-robux-game-hack
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-quora_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-free-admin-in-roblox_GM431946152.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-can-i-get-robux_GM431946152.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/master-coin-free_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-cheats_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-free-coins_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-minecraft-for-free_GM479516143.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-hack-version-2021-free-download_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-robux-on-ipad_GM431946152.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-hack-someone-on-roblox-2021_GM431946152.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-free-pet-snacks_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-help-free-robux_GM431946152.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/minecraft-images-free_GM479516143.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-doge-in-roblox_GM431946152.pdf
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b37.bin
50470757e5349f0be48931df59deeaf069abaf8bc2a6f7a5bafdff94b2208f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B37 20948 bytes
font_01_sfnt_off0000583a.bin
2c37171a150a2d14e4167a429db93bc04fd318d5912af8dc5788c47af11b4ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x583A 18980 bytes

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