Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98038c742b42692…

MALICIOUS

PDF

47.9 KB Created: 2021-06-11 05:36:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 826eea3620cc0e64fb1eb5da9d970ae1 SHA-1: e3e42f3cef8ad509faa1901fd06a501506c578ba SHA-256: f98038c742b42692474fe382df313a26b624e6c3491fef9a75512fda4ce437cd
142 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which appear to be SEO-optimized for game-related cheats and hacks. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into clicking a malicious link or downloading a payload. The document body and extracted URLs suggest a lure related to game exploits, specifically Roblox and Coin Master.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/roblox-hacked-client-2021-game-hack
    • http://apd-ukraine.de/images/hack-robux-to-get-free-clouves_GM431946152.pdf
    • http://apd-ukraine.de/images/www-bloxy-world-robux-free-robux_GM431946152.pdf
    • http://apd-ukraine.de/images/robux-earning-sites_GM431946152.pdf
    • http://apd-ukraine.de/images/codes-to-get-free-robux_GM431946152.pdf
    • http://apd-ukraine.de/images/spinuri-gratis-coin-master_GM406889139.pdf
    • http://apd-ukraine.de/images/how-to-use-redeemed-cards-on-roblox-no-hacks_GM431946152.pdf
    • http://apd-ukraine.de/images/all-free-items-in-roblox_GM431946152.pdf
    • http://apd-ukraine.de/images/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://apd-ukraine.de/images/coin-master-free-rewards-link_GM406889139.pdf
    • http://apd-ukraine.de/images/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://apd-ukraine.de/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://apd-ukraine.de/images/free-tiktok-likes-and-followers_GM835599320.pdf
    • http://apd-ukraine.de/images/game-hunters-coin-master_GM406889139.pdf
    • http://apd-ukraine.de/images/roblox-commands-hack-download_GM431946152.pdf
    • http://apd-ukraine.de/images/minecraft-hack-2021_GM479516143.pdf
    • http://apd-ukraine.de/images/coin-master-free-cards-link-2021_GM406889139.pdf
    • http://apd-ukraine.de/images/cheats-for-bloody-mary-roblox_GM431946152.pdf
    • http://apd-ukraine.de/images/coin-master-games-download-free_GM406889139.pdf
    • http://apd-ukraine.de/images/robloxhacks_GM431946152.pdf
    • http://apd-ukraine.de/images/free-robux-real-working_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005157.bin
c25a410337505f26a23bdff19e5f77ffcfe1e0a480a447f0aca247376f4ae8be
pdf-font-stream PDF embedded font (sfnt) at offset 0x5157 24904 bytes
font_01_sfnt_off00008af4.bin
4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF4 3400 bytes
font_02_sfnt_off0000961e.bin
80a0bd14c0b1bf08e15348c1e3801b27f4e1b9f3dcecf5dbb3d144db2c6a90d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x961E 18984 bytes