Malicious PDF — malware analysis report

Static analysis result for SHA-256 c196e385dd91e5a0…

MALICIOUS

PDF

42.1 KB Created: 2021-05-17 06:12:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5ffdb8fe160d665862f2872de47c3ef8 SHA-1: a4f3d5d6ca8b39050c5a4e17de8b2755f2ef52bf SHA-256: c196e385dd91e5a07175cb9ea9527234230e4208e3deccb4942d2157938a0aa0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering game cheats and hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a link farm designed to attract users searching for these terms. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains obfuscated text and URLs, including 'https://netcdn.xyz/app/406889139/coin-master-cheats-2021-game-hack', which likely serves as a lure for a malicious download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-cheats-2021-game-hack
    • http://centr-expert.su/images/free-coins-for-coin-master_GM406889139.pdf
    • http://centr-expert.su/images/minecraft-launcher-free_GM479516143.pdf
    • http://centr-expert.su/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://centr-expert.su/images/pasos-para-hackear-coins-master_GM406889139.pdf
    • http://centr-expert.su/images/free-minecraft-svg-cutting-files_GM479516143.pdf
    • http://centr-expert.su/images/roblox-robux-generator-no-human-verification_GM431946152.pdf
    • http://centr-expert.su/images/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://centr-expert.su/images/change-roblox-username-free_GM431946152.pdf
    • http://centr-expert.su/images/robloxhacks_GM431946152.pdf
    • http://centr-expert.su/images/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://centr-expert.su/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://centr-expert.su/images/coin-master-hack-no-verify_GM406889139.pdf
    • http://centr-expert.su/images/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdf
    • http://centr-expert.su/images/i-want-robux_GM431946152.pdf
    • http://centr-expert.su/images/coin-master-hack-no-survey_GM406889139.pdf
    • http://centr-expert.su/images/coin-master-daily-free-spin-app_GM406889139.pdf
    • http://centr-expert.su/images/hack-coin-master-without-verification_GM406889139.pdf
    • http://centr-expert.su/images/free-minecraft-account-list_GM479516143.pdf
    • http://centr-expert.su/images/free-robux-no-password_GM431946152.pdf
    • http://centr-expert.su/images/robux-cheat_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049c6.bin
16b20ac83c08f606f69f88ca4ad6ccb364a3a1163b3888a833ea00f4e9e77122
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C6 24868 bytes
font_01_sfnt_off000082c0.bin
8fd2be34c5ae6d36bafabdc0d90731bcc2dba590b40522d9b75e2e7b006908cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x82C0 18112 bytes