Malicious PDF — malware analysis report

Static analysis result for SHA-256 57afe71ea07ca3b4…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 17:24:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7ea08d065ad2e676a81a4df8a7d3afee SHA-1: d656b9aefcb8eacc8a6ea5fe2a0b42fbe2140857 SHA-256: 57afe71ea07ca3b4d6e638499b365bf771eaa551d4bea05e7b689b40a3f412fe
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm or content aggregation tactic. The primary URL, http://netcdn.tw/app/431946152/free-roblox-scrips-game-hack, and the numerous links hosted on gts.edu.gh, indicate an attempt to lure users to download or access potentially malicious content related to game cheats and hacks. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.tw/app/431946152/free-roblox-scrips-game-hack
    • http://gts.edu.gh/library/repository/coin-master-freebies_GM406889139.pdf
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-without-verification_GM431946152.pdf
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-with-cheat-engine-mac_GM431946152.pdf
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-no-download-2021_GM431946152.pdf
    • http://gts.edu.gh/library/repository/how-to-get-free-black-hair-in-roblox_GM431946152.pdf
    • http://gts.edu.gh/library/repository/hack-roblox-boku_GM431946152.pdf
    • http://gts.edu.gh/library/repository/free-bird-roblox-id_GM431946152.pdf
    • http://gts.edu.gh/library/repository/hire-a-hacker-for-roblox_GM431946152.pdf
    • http://gts.edu.gh/library/repository/coin-master-gold-cards-free_GM406889139.pdf
    • http://gts.edu.gh/library/repository/free-spins-coin-master-no-verification_GM406889139.pdf
    • http://gts.edu.gh/library/repository/roblox-cheat-engine-for-mac_GM431946152.pdf
    • http://gts.edu.gh/library/repository/coin-master-claim-free-spins_GM406889139.pdf
    • http://gts.edu.gh/library/repository/free-robux-no-genoater-or-surey_GM431946152.pdf
    • http://gts.edu.gh/library/repository/good-games-to-hack-on-roblox_GM431946152.pdf
    • http://gts.edu.gh/library/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdf
    • http://gts.edu.gh/library/repository/husky-1-million-free-robux_GM431946152.pdf
    • http://gts.edu.gh/library/repository/free-minecraft-server-hosting-24-7_GM479516143.pdf
    • http://gts.edu.gh/library/repository/roblox-btool-command-without-hacks_GM431946152.pdf
    • http://gts.edu.gh/library/repository/free-spins-on-coin-master-game_GM406889139.pdf
    • http://gts.edu.gh/library/repository/is-minecraft-education-edition-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d51.bin
1bc517a6f11c980f3236285a521e382d81eb1fe3a2bb6d101628710ec1744948		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D51 23116 bytes
font_01_sfnt_off0000616b.bin
2d9914779a7e499e4ac504a6db31819359276e75f4d1cb850b672aad4258c9d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616B 18760 bytes

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