Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e99908139626db…

MALICIOUS

PDF

35.0 KB Created: 2021-07-09 17:22:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a189fbd8bcd1b9177892414cf42a1a6 SHA-1: d0b80771be5d809c5d864ae0bb012678e29da213 SHA-256: c1e99908139626db643510ff5dc2fcf8b99f0fa6d6806e3de3603bc2ec8b7b40
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 explicitly promotes 'free' in-game items and currency for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, which likely lead to phishing sites or malware downloads.

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/431946152/how-to-get-free-roblox-money-game-hack
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/minecraft-realms-free-codes_GM479516143.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-coin-master-spin-app_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/tiktok-free-view-59_GM835599320.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/daily-free-spin-coin-master-link_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/hack-site-robloxcom-robus_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-coins-coin-master-iphone_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/google-how-do-you-get-robux_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/todays-free-spin-and-coin-links_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-free-spins-link-today-blogspot_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/try-minecraft-free_GM479516143.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/minecraft-net-download-free_GM479516143.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-do-you-get-free-clothes-in-roblox_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/sb-game-hacker-coin-master_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/roblox-games-that-give-free-radio_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/roblox-grand-blox-auto-5-lights-cheats_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031f8.bin
a1e1ad75a03c292e7979ad93d10eefe5d6134e82537395ce81441110ee31d6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31F8 22164 bytes
font_01_sfnt_off00006320.bin
62e2d478c3b8ba984cb5c2b5fd6287141d7fbbdf36fee583ba60af1fa784e302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 19296 bytes

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