Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85d3ec4c6d32690…

MALICIOUS

PDF

36.0 KB Created: 2021-07-01 21:31:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 021b0012c8fd76d02d6d44b2c1ba7fbb SHA-1: d4676277fd5783588131d210313115491edac650 SHA-256: c85d3ec4c6d32690c061fdd61fe2506aa79fb1efbba204bc45b50a5318f0677e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is classified as malicious due to its structure and content, which includes a large number of external links to game hack websites, suggesting a link farm or SEO abuse. The document also contains a lure to execute commands by copying and pasting content, a common tactic for tricking users into running malicious code. While no scripts were explicitly extracted, the presence of embedded URLs and the overall malicious classification indicate an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/roblox-hack-build-a-boat-for-treasure-game-hack
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-hack-2021-android-apk_GM406889139.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-free-spins-fb_GM406889139.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-speed-hack-june-1-2021_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-free-coins-spins_GM406889139.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-ti-get-free-clothes-with-no-robux_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-hack-someone-on-roblox-2021_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-robux-hack-2021-no-human-verification_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-hacks-for-epic-minigames_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/best-free-minecraft-servers_GM479516143.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-hack-activegamer_GM406889139.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/code-for-robux-free-2021-4th-of-july_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-robux-without-human-verification_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/hacks-minecraft_GM479516143.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/minecraft-pe-hacks-ios_GM479516143.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/robux-link_GM431946152.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/freespinandcoin_GM406889139.pdf
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-free-robux-by-joining-a-group_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034ec.bin
980fb33d4ec00fced75f3cf724729dd112902a8ee0ba3bd256ecfbc01f15412b
pdf-font-stream PDF embedded font (sfnt) at offset 0x34EC 22368 bytes
font_01_sfnt_off000066c8.bin
43f64cbbd547bd9f47f8236cd182045125f457c0fa8827fb30c06870bcf1c832
pdf-font-stream PDF embedded font (sfnt) at offset 0x66C8 19356 bytes