Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cfc7a676fdb043…

MALICIOUS

PDF

56.5 KB Created: 2021-06-02 05:49:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dca6dc910908e17df9a6bba7ed6cc8d3 SHA-1: 507b0be5d86cc17589e0634326bf2ae78ca7623f SHA-256: 04cfc7a676fdb043bdc22a030e34a80e856e698851b50985aec309a39c7fc2d8
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a 'download button' lure, all pointing towards deceptive content related to free game currency and items. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9693

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/431946152/free-robux-without-human-verification-game-hack PDF link annotation
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/robux-game-com_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/roblox-g_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55FC 40332 bytes
SHA-256: 70f64d4db1342af349ef19d09e0ac17998545f16e20894697084c605063fc365
font_01_sfnt_off0000ab71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB71 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000b819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB819 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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