Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6604bc0fe839b4…

MALICIOUS

PDF

35.3 KB Created: 2021-06-29 09:39:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9a81813b7b91b9a724fe22effafb82d5 SHA-1: aa428e3c65e056dffd628819261f796a2a0a5fcc SHA-256: 0a6604bc0fe839b4857ca2f239847da8157d19bc235c549aa5af08f9615ff26b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which are SEO-optimized to appear as legitimate downloads for game cheats like 'Free Robux'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a coordinated effort to direct users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.co/app/431946152/free-robux-hack-come-game-hack
    • http://legs11.co.za/images/free-script-executor-roblox_GM431946152.pdf
    • http://legs11.co.za/images/roblox-any-way-to-make-robux-for-free_GM431946152.pdf
    • http://legs11.co.za/images/robux-hack-without-installing-apps_GM431946152.pdf
    • http://legs11.co.za/images/i-think-someone-tried-to-hacked-my-roblox-account_GM431946152.pdf
    • http://legs11.co.za/images/free-nike-stuff-on-roblox_GM431946152.pdf
    • http://legs11.co.za/images/free-coin-master-gift-link_GM406889139.pdf
    • http://legs11.co.za/images/how-to-hack-alone-batle-royale-with-roblox_GM431946152.pdf
    • http://legs11.co.za/images/free-spins-coin-master-october-17-2021_GM406889139.pdf
    • http://legs11.co.za/images/how-to-hack-roblox-accounts-in-game-with-rc7_GM431946152.pdf
    • http://legs11.co.za/images/roblox-r7-hack-2021_GM431946152.pdf
    • http://legs11.co.za/images/free-robux-no-human-verification-2021-or-survey-no-scam_GM431946152.pdf
    • http://legs11.co.za/images/free-robux-discount_GM431946152.pdf
    • http://legs11.co.za/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdf
    • http://legs11.co.za/images/roblox-cash-hack_GM431946152.pdf
    • http://legs11.co.za/images/roblox-jailbreak-free-cars_GM431946152.pdf
    • http://legs11.co.za/images/tiktok-comments-free_GM835599320.pdf
    • http://legs11.co.za/images/coin-master-game-free_GM406889139.pdf
    • http://legs11.co.za/images/free-robux-cards-2021-november_GM431946152.pdf
    • http://legs11.co.za/images/free-links-for-coin-master_GM406889139.pdf
    • http://legs11.co.za/images/red-boy-v2-jailbreak-roblox-hack-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032a7.bin
21be69cda23e6b9ec81f995e25df2294c7dce6547f20210026ad53b84124a647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32A7 22412 bytes
font_01_sfnt_off000064b6.bin
2e0bda52ab89121c3ff5afac3bb63f546e1c64294a1b4e669a2984dea59c94b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B6 19148 bytes

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