Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e98be56f02d67a…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 00:21:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e26b289506f4ac07d35c88b7e43cea71 SHA-1: 56c3a0e22f225bbe8d094a46469d76e7947344dc SHA-256: c4e98be56f02d67a9cb03c104b3edb6acaf047e84b64bebc815963668135c01c
142 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to files with 'robux' or 'coin master' in their names, suggesting a lure for game-related cheats or hacks. The presence of a fake CAPTCHA heuristic strongly indicates a social engineering attempt to trick the user into clicking these links. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily corrupted, contains a URL that aligns with the observed link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/como-tener-anti-gravedad-en-roblox-hack-check-cashed-game-hack
    • http://katalog.gemalibrary.net/repository/robux-link_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-2021-haktuts_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-tool-hack_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-gift-link-hack_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/mcpe-master-coins-hack-download_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/roblox-online-free-no-download_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/free-acc-on-roblox-with-rbx-and-bc_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/free-spin-app-for-coin-master_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/roblox-free-items-glitch_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-gameplay_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/free-avatar-roblox_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/free-coin-link-for-coin-master_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/roblox-fly-hack-cheat-engine-2021_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/free-minecraft-accounts-2021_GM479516143.pdf
    • http://katalog.gemalibrary.net/repository/free-robux-no-human-verify_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/how-to-hack-people-on-roblox_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-ad-on-youtube_GM431946152.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • http://katalog.gemalibrary.net/repository/coin-master-mod-version-free-download-ios_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fe9.bin
819b05a29eaa41e8a12b2a72a8215a0dfc0ed59d427f1650d55f83383af724fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE9 26292 bytes
font_01_sfnt_off00008b9d.bin
a65db0178517f338cd891cb6b0d9a84725c4ee55d940aa77338ec6e64169f5a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9D 19120 bytes

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