Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2a3dca9e013d7a…

MALICIOUS

PDF

35.8 KB Created: 2021-07-05 19:53:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8bb04ef1b2113bebdf1d402115911e5b SHA-1: deec078755d2de61183e081e0e317a8f768246b9 SHA-256: ef2a3dca9e013d7af8a45446c742634e3b75293897cf0ccceb19efca8af20a1c
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are structured as SEO-optimized slugs pointing to websites offering game-related cheats and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a deliberate attempt to create a link farm. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves luring users to these external sites, which likely host malicious content or phishing pages.

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/479516143/how-to-make-a-modded-minecraft-server-for-free-game-hack
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/hacks-for-roblox-prison-life_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/roblox-booga-booga-hack_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-coins-in-coin-master-game_GM406889139.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-400-spin-link-today_GM406889139.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-spins-coin-master-links_GM406889139.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/roblox-hack-free-robux-com_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-apk-october-2021_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-hack-roblox-on-ipad_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-roblox-gear-2021_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/roblox-how-to-look-cool-for-free-2021_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-on-meep-city-2021_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-apps-that-work_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/roblox-undetectable-cheat-engine_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/2021-hacks-for-robloxs_GM431946152.pdf
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-links-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035d6.bin
04ec42538ec570e30ba530bc96795281c04694a6eb6801378ce248fc4db66828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35D6 22688 bytes
font_01_sfnt_off00006853.bin
df87efe88f9b7a5d5bd41d63fb7a470dae4d726181a292b977cdfc12aa609571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6853 18620 bytes

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