Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2a7cf0e38e4c3e…

MALICIOUS

PDF

42.3 KB Created: 2021-05-16 14:41:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ac55e770085835596b62a2bffd2c9364 SHA-1: 978aef39b3b1730e40e5bc3c2f5ec21a3be8f8d3 SHA-256: 8f2a7cf0e38e4c3ef58e1ac25bd3d78cd9b8021f16a1015d7f6f59e3937ab731
102 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which are structured as SEO-friendly slugs pointing to files related to popular games like Minecraft and Coin Master, as well as Robux generators. The primary URL, https://netcdn.xyz/app/479516143/minecraft-game-hack, suggests a lure for game-related cheats or hacks. The heuristic PDF_SEO_LINK_FARM firing indicates a mass of external links, reinforcing the malicious intent to direct users to potentially harmful content. The ML_NYX_PDF_MALICIOUS score further supports the classification of this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/minecraft-game-hack
    • http://westt.com.br/ckfinder/userfiles/files/free-400-spins-coins-master_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-hack-apk-link_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-spins-in-coin-master-2021_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-robux-no-human-verification_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-vpn-for-minecraft_GM479516143.pdf
    • http://westt.com.br/ckfinder/userfiles/files/daily-coin-master-free_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/game-hunters-coin-master-free-spins_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-free-spins-2021-haktuts_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-coins-coin-master-hack_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/hack-coin-master-game-apk-download_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-coin-master-card-free_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ba9.bin
14d3ae5a05d1afa3695ff3f7c01f6e4ac90b1bd3056a54433a828729c5cfcdb9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA9 25288 bytes
font_01_sfnt_off0000854c.bin
ce96ee2cb1800a95c911c77dfe81c9a72a479049c6676c05affe2ae793ebac2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854C 17568 bytes

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