Malicious PDF — malware analysis report

Static analysis result for SHA-256 def59aa38dd7d76e…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 16:31:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b8dbf83e173e729d1b9bf168f5c9d160 SHA-1: 98ce60425e699ad69b603f97416d1cbbb51bfd6b SHA-256: def59aa38dd7d76e62dc9fa826de645183175e95c9cc55068f4d849603e382df
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 structured as SEO-optimized PDF files related to game hacks and free in-game items. The primary URL, http://netcdn.tw/app/479516143/how-to-get-minecraft-for-free-on-ps4-game-hack, suggests a lure for downloading potentially malicious content disguised as game cheats. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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-get-minecraft-for-free-on-ps4-game-hack
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/hacked-roblox-game_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-a-dominus-on-roblox-for-free_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-hack-script-animations_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-robux-games-hacked-my-roblox-account_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-robux-2021-without-builders-club_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-hack-elemental-battlegrounds-roblox-2021_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/hacks-for-roblox-map-kat_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/easy-robux-today-com_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/play-store-games-free-download-roblox_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-account-hacker-tool_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/minecraft-pc-download-free-full-version_GM479516143.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-followers-for-roblox_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-cheat-guide_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-robuxs-app_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-dragon-ball-rage-stats-hack-site-v3rmillionnet_GM431946152.pdf
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-coin-and-spin-in-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_off000031a1.bin
5464f95ba7efbfad873ea56a074667a9eff1beaa3f498f30124bb2f4af1718dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31A1 22100 bytes
font_01_sfnt_off00006166.bin
0d760cff5007a49e50dd6d9a817509808964517a77fc66864bf171130f1b0882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6166 18380 bytes

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