Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4efdb0ffe7639f2…

MALICIOUS

PDF

46.5 KB Created: 2021-05-17 16:37:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 93cc5f2f7e476d05f7587c4a074857cc SHA-1: 898c118f4e24b27928280e14cc576c6b0d4649ab SHA-256: c4efdb0ffe7639f23d9b51211c867987e700c0e4b871bdc82033fd94d278b398
150 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a fake CAPTCHA, indicating an attempt to trick the user into executing malicious code or downloading further payloads. The document also features a large number of external links, many pointing to other PDFs, suggesting a link farm designed to distribute malicious content or engage in SEO manipulation for phishing purposes. The primary URL https://netcdn.xyz/app/431946152/apps-for-free-robux-game-hack is likely the distribution point for the intended malicious application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/apps-for-free-robux-game-hack
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-hack-app_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-robux-link_GM431946152.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-robux-no-password_GM431946152.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-minecraft-texture-packs-java_GM479516143.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/is-roblox-free-on-ps4_GM431946152.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-free-spins-fb_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-coins-on-coin-master_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-daily-free-link_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-robux-sites-that-work_GM431946152.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-minecraft-domain_GM479516143.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/free-robux-without-any-verification_GM431946152.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-game-hacks_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/how-to-hack-a-minecraft-account_GM479516143.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/coin-master-hack-tool-no-human-verification_GM406889139.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/flame-gg-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c44.bin
756659f8d158c4ad9ef458b887582f8d1f62233336a492c6f7c35fd4b8132d1a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C44 31584 bytes
font_01_sfnt_off00009442.bin
b6bed13222f637b3eaa93fd3412fcfb5f097d091c9d6b8306e759aa57a7fe68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9442 18192 bytes

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