Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dee00799308065…

MALICIOUS

PDF

49.8 KB Created: 2021-06-08 17:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ea3a045cd591010d5b539e0271522d63 SHA-1: 78319368abddf77df4b76c229d2e3707c8b866a8 SHA-256: 39dee0079930806560a2f50269314d0438976ffd74de54fb7717fe9fbabeecd0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to host or redirect to malicious files, likely game cheats or hacks. The presence of a 'password-protected archive handoff' heuristic suggests the document is intended to trick users into downloading a password-protected file, which is a common tactic to bypass security scanning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/speck-elements-hack-roblox-game-hack
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-spins-link-download-hack_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-reddit_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-do-you-get-robux_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-spin-link-in-coin-master-game_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-without-offers_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-claim-free-spins_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-xyz-2021_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-without-human-verification_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/roblox-admin-hack_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/roblox-robux-hack-generator_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/tiktok-likes-for-free_GM835599320.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e7.bin
934cf0fbc6155ba78244d318e8634857c35fe10eeb792b3589c2ef81d544b99f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E7 28988 bytes
font_01_sfnt_off000094c1.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94C1 2880 bytes
font_02_sfnt_off00009eab.bin
9d8c22ad6270bfe74c235fe9c7294248300da95c1492a5de3be25fc4b30d1c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAB 18720 bytes

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