Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc6f540956188a0…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 10:28:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ed94f488e67f710f06d9fd57db513a39 SHA-1: ef8769aa3cacd529ea8c6ce346871623c029651e SHA-256: 5bc6f540956188a087e8196f00eb568cef2e5c266080c460b360fb89544b98d0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs and a prominent call-to-action related to free Robux and game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links and the lure content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/claim-free-robux-button-game-hack
    • http://lib.smklabor.sch.id/repository/coin-master-hack-without-human-verification-india_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/javascript-free-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/minecraft-games-to-play-for-free_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/minecraft-free-no-download_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-hacks-for-iphone_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-hack-apk_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/robux-free-com_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-400-spin-link-today_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/free-spin-link-coin-master-today_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-daily-free-spins_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/how-do-u-get-free-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/claim-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-robux-generator-without-human-verification_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-spin-and-coin-blogspot_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-game-hacking_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/all-minecraft-handbooks_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000519c.bin
d059d0dd250210a9b2a96ee5208bde6fc5c41d6182377a85ec4387e2a2844027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x519C 24644 bytes
font_01_sfnt_off000089f1.bin
1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F1 2824 bytes
font_02_sfnt_off0000939e.bin
a65a8cc7dc4bcbd85f0772ba27416f5bddaec9beaf507a16cddd286b7aed5464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939E 18800 bytes

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