Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16a67b5d63540b8…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 19:11:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 561332bfb01b0d427962be19dc1352b5 SHA-1: 8636dda96191aa4b088d81baebed3c0f99faab43 SHA-256: c16a67b5d63540b8b0bf4d5ec0687d8810051abcf5210ce8cf54069404c21354
102 Risk Score

Malware Insights

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

The PDF document contains a mass external link farm pointing to various game-related hack PDFs, suggesting a lure for users seeking cheats or exploits. The presence of a call-to-action button and embedded URLs further supports the intent to redirect users to potentially malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/app-master-game-hack
    • http://juscor.com.br/ckfinder/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-builders-club-free_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/hacks-to-get-free-robux_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-latest-version-hack_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-hack-coin-master-android_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/hacked-roblox-game_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-hack-minecraft-pe_GM479516143.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-inappropriate-games_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/sites-to-get-free-robux_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-come_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-coins-coin-master-no-human-verification_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004825.bin
de6f57b9632e503969d6ae59fb85b3e3268f489bb91775310ea391d977a52732
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4825 30804 bytes
font_01_sfnt_off00008a0c.bin
4464f59f323fc065d9701067f709c7b39ed9c448b1d3d372901e8849389ccaec
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0C 17460 bytes