Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6307371c3af8e0…

MALICIOUS

PDF

45.0 KB Created: 2021-05-14 00:02:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fec94fad5a577f109122e60e7452da70 SHA-1: ab92bfb5995a10b409dda44c46a031a811a3d591 SHA-256: 9f6307371c3af8e065a483707a1f2e7143ee3b296a0df8672ac590552ccbb0b1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to websites offering game hacks and free in-game currency. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely to direct users to potentially harmful sites. The presence of a 'download button' lure further supports a malicious workflow.

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 https://netcdn.xyz/app/431946152/can-you-earn-robux-game-hack
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-private-server-roblox_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-robux-offers_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-do-we-get-free-robux_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/roblox-games-with-free-vip-servers_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/give-me-robux-now_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/roblox-gang_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-free-coins-facebook_GM406889139.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/easy-way-to-get-free-robux_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/twitter-coin-master-free-spins-link_GM406889139.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/robux-2021_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-free-spins-link-march-2021_GM406889139.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/roblox-18_GM431946152.pdf
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/get-free-robux-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d07.bin
fa98fa6ab204ee473d1c62da1bcc3554492fb52fd5b0a3b94a5dc4c417060e97		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D07 28136 bytes
font_01_sfnt_off00008ded.bin
1c466f67520169acba027fb91543220cbf56487677621f385a3c2073f3a032f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DED 18240 bytes

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