Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf55289635dcdad…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 21:07:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4f22dd5ac364adf9e56d46a9f6c9a402 SHA-1: d2042f57e5fa3be698f0f9052eab533636bfdbb0 SHA-256: 3bf55289635dcdad5315e4a909566b3a4fd2b00341ca0b7508f616107bc486f2
102 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to game-related hacks and cheats, suggesting a lure for users to download potentially malicious files. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, and the ML_NYX_PDF_MALICIOUS score is very high, confirming malicious intent. The primary URL http://netcdn.tw/app/479516143/wurst-commands-game-hack is likely the payload delivery point.

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/wurst-commands-game-hack
    • http://www.salwangurgaon.com/files/get-free-coin-master_GM406889139.pdf
    • http://www.salwangurgaon.com/files/games-in-roblox-that-will-give-you-free-robux_GM431946152.pdf
    • http://www.salwangurgaon.com/files/coin-master-free-spins-link-may-2021_GM406889139.pdf
    • http://www.salwangurgaon.com/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://www.salwangurgaon.com/files/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdf
    • http://www.salwangurgaon.com/files/free-robux-hack_GM431946152.pdf
    • http://www.salwangurgaon.com/files/promo-codes-to-get-free-robux_GM431946152.pdf
    • http://www.salwangurgaon.com/files/how-to-contact-roblox-for-hack-acount_GM431946152.pdf
    • http://www.salwangurgaon.com/files/free-robux-no-survey-at-all_GM431946152.pdf
    • http://www.salwangurgaon.com/files/100-free-spins-on-coin-master_GM406889139.pdf
    • http://www.salwangurgaon.com/files/freespinandcoin-blogspot-coin-master_GM406889139.pdf
    • http://www.salwangurgaon.com/files/how-to-hack-coin-master-using-es-file_GM406889139.pdf
    • http://www.salwangurgaon.com/files/free-minecraft-mods-for-xbox-one_GM479516143.pdf
    • http://www.salwangurgaon.com/files/coin-master-free-coins-and-spins-online-tool_GM406889139.pdf
    • http://www.salwangurgaon.com/files/wwwcoin-master-hack-game-download_GM406889139.pdf
    • http://www.salwangurgaon.com/files/mc-hacks_GM479516143.pdf
    • http://www.salwangurgaon.com/files/free-roblox-accounts-2021_GM431946152.pdf
    • http://www.salwangurgaon.com/files/wurst-download_GM479516143.pdf
    • http://www.salwangurgaon.com/files/hacks-para-roblox-2021_GM431946152.pdf
    • http://www.salwangurgaon.com/files/minecraft-education-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e93.bin
481a07c202cac1eec8f70b46a24896a446b73b403cb8478e7a768d2f981c6de9
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E93 22356 bytes
font_01_sfnt_off00006017.bin
2aa4b3a06f8f810455c2de55047681fbe1f4f7c5efd97b9b8db0efc9e0a5a8f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6017 18652 bytes