Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc412e4dc5985633…

MALICIOUS

PDF

41.3 KB Created: 2021-05-14 16:36:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e58b2bfbaf985363590715e48ace03b3 SHA-1: 0a9eda941c8456c8eee433686afdb2be6094d92f SHA-256: bc412e4dc5985633c06c5081a7ce61ddd6503cf90556fedbc5b1b98bc46f2e2c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body that promotes game cheats and virtual currency, strongly suggesting a lure for users to click these links. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely part of a link farm designed to attract traffic. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this document.

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-spin-pattern-game-hack PDF link annotation
    • http://dieter-sauter.com/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/moon-active_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://dieter-sauter.com/images/roblox-hax_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000472a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x472A 24872 bytes
SHA-256: 4451aac7a3d5f4898b7350426975b3ee803154ca77177385cb85f4396f89dccb
font_01_sfnt_off00008056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 17876 bytes
SHA-256: bd22fd35e13567494ff4a803842d6b5fa952e975cd9e2293b3775db85ba13e50

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