Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e5c0d5aa031a81…

MALICIOUS

PDF

42.4 KB Created: 2021-05-17 14:22:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: da51f67e394a7a44de11507d07428788 SHA-1: c891f6a948b8b133e9eea83b8c0192e2f352653c SHA-256: 37e5c0d5aa031a811ffc344926eef8a3f5ceb63facba3826f02eaa6a02083264
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with SEO link farms and potentially malicious content. The document body and extracted URLs suggest a lure for users seeking game hacks or currency, which is a common tactic for distributing malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/real-robux-game-hack
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-coins-app_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-unlimited-spins_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-hack-apk-no-survey_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/free-roblox-generator_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/free-coin-master-hack-no-verification_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/scaffold-minecraft-hack_GM479516143.pdf
    • https://aits.co.id/ckfinder/userfiles/files/roblox-hack-site_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-spins-link-today-hack_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/free-pet-snacks-coin-master_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-spins-save_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-hack-2021_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/como-generar-coin-master-free-spins_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/roblox-free-robux-website_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004888.bin
f3cefb423078b5e5a84c0881df7b8f3129639a3c14fba4f66b529a2f0046c2e7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4888 25248 bytes
font_01_sfnt_off0000838e.bin
122d2ae9912be3fd3cd6fd29e560213cf54dafc8cf3a40d46cc77b1cbc878b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838E 18152 bytes

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