Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d1c3e2dd4357f8…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 19:48:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3a419f590ae2f53c06e028f5aa6ed7c9 SHA-1: 055f49f4b7a93149f0806b5c2f3877edc14603bc SHA-256: 20d1c3e2dd4357f8175f5eb40dd58d21465e93bdaf6d71307d12232eb16beb63
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF documents promising free Robux or Coin Master spins. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely to direct users to scam or malware download pages. The presence of a 'download' button lure further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-by-playing-games-game-hack
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/roblox-girl-avatar_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/google-how-do-you-get-robux_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/daily-free-spin-link-in-coin-master_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-35-13-hack-download_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-hack-robux-on-roblox-2021_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/master-free-spin_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/roblox-paintball-cheat-codes_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/ultimate-driving-roblox-cheats_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-gift-robux-on-mobile_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003049.bin
440548ef8751481551076763eeddf28a6512b1d791a642e04ad0eda587a516de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3049 22212 bytes
font_01_sfnt_off000061a8.bin
9e977a5575cc9b35e2b14531736cd30bfd9bd13fa3776d4baf53e95f9fc8fb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 19772 bytes

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