Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c7b588006b8e41…

MALICIOUS

PDF

34.9 KB Created: 2021-07-01 09:12:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 77828880d9f97bce8b942be09c674b51 SHA-1: 1e4868b0a4042e7f60e3223786e3bacecef6ad3b SHA-256: 63c7b588006b8e41bf98d362bbb146b7f264dbd8375b47e79f95f74c177fe237
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that promotes free in-game currency and accounts for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier flagged the PDF as malicious. The primary attack pattern involves luring users to potentially malicious websites via these links, likely for credential harvesting or malware distribution.

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/how-do-u-get-free-robux-2021-game-hack
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-hack-cheat-engine-2021_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-robux-generator-hack-download_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-400-spin-link_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/hack-robux-free-pastebin-no-subscribe_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-roblox-accounts-2021-august_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-34-4-free-download_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-roblox-pro-accounts_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-links-to-get-free-spins_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-tiktok-accounts-with-followers_GM835599320.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-coin-link-for-coin-master_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-do-i-get-free-hair-on-roblox_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/cheats-to-type-in-roblox_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-song-code-for-cheat-codes_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/hacks-to-get-free-robux_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-hack-coin-master-game-ios_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-games-like-roblox_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-free-gucci-pants_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ee8.bin
ecd123615a31ba4ee0986fb17b4a302a529677a24d428ce852d4ff051ab53432
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE8 22700 bytes
font_01_sfnt_off00006192.bin
ee909949778bcc1eaeaae663f07e5a0770d7aed4eef67476ef7171e54895eba2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6192 19556 bytes