Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd41ed7fcc810b24…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 18:29:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8862157564a90c1e64b2f96f9d4350bd SHA-1: 09c5cc18561358aab3f5fe193ca67f09c1998074 SHA-256: dd41ed7fcc810b24c44fa54e15294f6feb481f5fe909ef15b615dc6dd47153fa
102 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, identified as a link farm, that point to various websites offering free in-game currency or hacks. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests a redirection to potentially malicious sites. The document's content and structure are designed to trick users into clicking these links, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-daily-free-spin-app-game-hack
    • https://cuc.ac.cr/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://cuc.ac.cr/userfiles/files/coin-master-key-free-spin_GM406889139.pdf
    • https://cuc.ac.cr/userfiles/files/free-roblox-premium_GM431946152.pdf
    • https://cuc.ac.cr/userfiles/files/free-minecraft-skin-packs_GM479516143.pdf
    • https://cuc.ac.cr/userfiles/files/how-to-get-more-free-coins-on-coin-master_GM406889139.pdf
    • https://cuc.ac.cr/userfiles/files/free-tiktok-coins_GM835599320.pdf
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-apk-2021_GM406889139.pdf
    • https://cuc.ac.cr/userfiles/files/tiktok-free-movie-hack_GM835599320.pdf
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • https://cuc.ac.cr/userfiles/files/gameoffice-net-hack-coin-master_GM406889139.pdf
    • https://cuc.ac.cr/userfiles/files/coin-master-free-gold_GM406889139.pdf
    • https://cuc.ac.cr/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • https://cuc.ac.cr/userfiles/files/best-free-hacked-client_GM479516143.pdf
    • https://cuc.ac.cr/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdf
    • https://cuc.ac.cr/userfiles/files/but-link-says-free-robux_GM431946152.pdf
    • https://cuc.ac.cr/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdf
    • https://cuc.ac.cr/userfiles/files/my-roblox-avatar_GM431946152.pdf
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005008.bin
8c1a41bf25183349b952afad65fc622f8b92919aba89837d97de5d20433e643d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5008 25280 bytes
font_01_sfnt_off000088c9.bin
f9a3a46f76b0cae8a4d9bd0baf07f2a5aefd3f4554b846be65e0119e8f17791d
pdf-font-stream PDF embedded font (sfnt) at offset 0x88C9 18308 bytes