Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadccb88c34f935a…

MALICIOUS

PDF

37.1 KB Created: 2021-06-26 15:06:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 919b0c50fd46ec88bcbb51c3b8b5b108 SHA-1: 9f994f8875151edaa5dd40cdbc9ea918bb969e4c SHA-256: cadccb88c34f935a2ae9b385dc6e79f2c9feabd15dce6798380d20b0e75f78cf
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 presented as guides for obtaining free in-game items or currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a tactic to drive traffic to potentially malicious or ad-filled pages. The ML classifier also flagged this PDF as malicious with high confidence.

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/how-to-get-roblox-packages-for-free-game-hack
    • http://legs11.co.za/images/hacks-to-get-free-robux_GM431946152.pdf
    • http://legs11.co.za/images/roblox-password-hacker_GM431946152.pdf
    • http://legs11.co.za/images/coin-master-free-spins-and-coins-haktuts_GM406889139.pdf
    • http://legs11.co.za/images/coin-master-hack-android-root_GM406889139.pdf
    • http://legs11.co.za/images/play-coin-master-for-free_GM406889139.pdf
    • http://legs11.co.za/images/groups-in-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://legs11.co.za/images/free-robux-generator-no-survey-or-human-verification_GM431946152.pdf
    • http://legs11.co.za/images/aimbot-hacks-for-roblox-cbro_GM431946152.pdf
    • http://legs11.co.za/images/free-coins-on-coin-master_GM406889139.pdf
    • http://legs11.co.za/images/give-me-free-robux_GM431946152.pdf
    • http://legs11.co.za/images/brady2021-got-hacked-on-roblox_GM431946152.pdf
    • http://legs11.co.za/images/free-robux-pastebin_GM431946152.pdf
    • http://legs11.co.za/images/minecraft-bedrock-free-download-pc_GM479516143.pdf
    • http://legs11.co.za/images/roblox-mod-apk-unlimited-robux-hack_GM431946152.pdf
    • http://legs11.co.za/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • http://legs11.co.za/images/free-draw-alpha-roblox_GM431946152.pdf
    • http://legs11.co.za/images/free-robux-please_GM431946152.pdf
    • http://legs11.co.za/images/coin-master-free-spin-codes_GM406889139.pdf
    • http://legs11.co.za/images/minecraft-java-edition-download-free_GM479516143.pdf
    • http://legs11.co.za/images/tiktok-i-feel-kinda-free-song_GM835599320.pdf
    • https://www.roblox.com/.I
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000039a6.bin
acc89df636c2ace36945fb7efddd78574393bca58764cc790ce5fc26bbee98d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x39A6 22572 bytes
font_01_sfnt_off00006b9d.bin
35c8c96371de4421780fe95dd0efb483860e7f92d5064619fbcc872ab051362f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9D 19244 bytes

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