Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95bef082e23d42d…

MALICIOUS

PDF

34.4 KB Created: 2021-06-25 10:33:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0248a4dcabb2e2f607970cd8d49efbce SHA-1: e197d4cf3549fee464ab9e2cff67d0dd0026da84 SHA-256: c95bef082e23d42dcb041f0fb662a066487dc2c16334f7dbed64bc30c607108c
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are presented as download links for in-game currency or cheats for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern is to trick users into clicking these links, likely leading to the download of malware.

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/free-robux-cards-not-used-game-hack
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/cerberus-free-download-roblox_GM431946152.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/how-get-free-clothes-in-roblox_GM431946152.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/coin-master-fan-club_GM406889139.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/today-free-spin-coin-master_GM406889139.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/coin-master-cards-for-free_GM406889139.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/spin-rewards-coin-master_GM406889139.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/coin-master-free-spin-sites_GM406889139.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/minecraft-for-free-on-phone_GM479516143.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-robux-for-roblox-pc_GM431946152.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-robux-hack_GM431946152.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/pokemon-go-free-candy-cheat_GM1094591345.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-coin-master-spins-link_GM406889139.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/tiktok-free-view-uk_GM835599320.pdf
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/minecraft-hacks-wurst_GM479516143.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
e2bf3005154dcacaf2da3f569dba084d169097bef89dd0d82a72e25df31b7c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F36 22468 bytes
font_01_sfnt_off00006151.bin
c380934854d0529fb9f106307687caddf562491c4649437a693b6e6c43e1a2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6151 18996 bytes

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