Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d89db7a2d7cf4cf…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 11:08:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2cd1bf0f9ae1e512477e3ae501500353 SHA-1: 8774c936d828c4d581e4bbf7b15136a6b8194791 SHA-256: 3d89db7a2d7cf4cfa53b23159e9f1c17c140cf0ecdaeb34eeaf9d7560bf56735
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to external resources related to game cheats and converters. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a tactic to attract users with lures for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to distribute 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.tw/app/479516143/universal-minecraft-converter-free-game-hack
    • https://zarco.co.in/uploaded_files/userfiles/files/coins-master-hacks_GM406889139.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-cheat-in-iphone7-roblox-piano-tiles-2_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/free-posed-golden-ffreddy-roblox_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-free-obc-lifetime-code-generator_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/free-girl-hair-in-roblox_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-hat-free-2021_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/free-roblox-items-codes-2021_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/buy-robux-free_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-easy-and-fast_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-but_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-hack-free-spins_GM406889139.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/hack-de-una-espada-ra-roblox_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/daily-free-spins-coin-master_GM406889139.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-online-free-sign-up_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/roblox-50-dollar-card-free_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-50-free-robux_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-fast-and-easy-no-survey_GM431946152.pdf
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-hack-roblox-games_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030fa.bin
7053d8d3f831f2c2b47ca0ea0f66212ded5cd745a51c2b7c6766c879864bd7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30FA 22132 bytes
font_01_sfnt_off000061f4.bin
7d318ad6347a4557b0fba1c54e9227a7af1ff8e9321d667927090105f213260a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F4 18372 bytes

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