Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c6ccfae542f90d…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 13:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fa4f1e8e4c471b7ce74fc057ecefff6b SHA-1: 79d22ef0bf929152823698a71209edbdd974c9d8 SHA-256: c0c6ccfae542f90dcafe2ba3b7838cb2737012579757700f9b4c1f0d32bebda0
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking external links, which is a common social engineering tactic. The document also contains a large number of links to other PDFs hosted on similar domains, suggesting a link farm designed to drive traffic or distribute further malicious content. No scripts were extracted, but the presence of numerous external links and the fake CAPTCHA strongly indicate a malicious intent to redirect users to potentially harmful sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/how-to-get-free-clothes-on-roblox-2021-game-hack
    • https://hekl-software.de/images/roblox-free-robux-website_GM431946152.pdf
    • https://hekl-software.de/images/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • https://hekl-software.de/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://hekl-software.de/images/coin-master-hack-tool-v1-9_GM406889139.pdf
    • https://hekl-software.de/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • https://hekl-software.de/images/coin-master-hack-apk-latest-version-2021_GM406889139.pdf
    • https://hekl-software.de/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdf
    • https://hekl-software.de/images/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdf
    • https://hekl-software.de/images/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://hekl-software.de/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://hekl-software.de/images/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • https://hekl-software.de/images/coin-master-hack-with-facebook-login_GM406889139.pdf
    • https://hekl-software.de/images/how-to-get-spins-on-coin-master-hack_GM406889139.pdf
    • https://hekl-software.de/images/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdf
    • https://hekl-software.de/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdf
    • https://hekl-software.de/images/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://hekl-software.de/images/free-minecraft-bedrock_GM479516143.pdf
    • https://hekl-software.de/images/coin-master-free-spins-reddit_GM406889139.pdf
    • https://hekl-software.de/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://hekl-software.de/images/united-gaming-net-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004967.bin
9ad165d952937ef7a497d7342107bae22eee9597241203969e0d4861cae8bf85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4967 24852 bytes
font_01_sfnt_off00008294.bin
3c41f18d23af06dd255ad2765babc942943b8f7b2ccda7aca72567751bee4f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8294 18784 bytes

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