Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d946f0f1db7416f…

MALICIOUS

PDF

48.1 KB Created: 2021-06-11 11:47:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 92be23c6ddaa8c63c3809205093cda28 SHA-1: 2cf4b82ce7f413ba9da0f5684b619f2fde68292a SHA-256: 9d946f0f1db7416ff4a5a4ba6b27b58a9541b1c46904716ecdf5ac5095c63f13
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which appear to be part of a link farm designed to direct users to pages offering game cheats or hacks. The document body, though partially corrupted, contains references to 'Cheats For Robux 2021' and a URL that aligns with this theme, suggesting a lure for potentially unwanted or malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/cheats-for-robux-2021-game-hack
    • http://juscor.com.br/ckfinder/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-link-today_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-blogspot_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-hack-ios-apk_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-place-rewards_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/master-coin-free-link_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-hack-no-verification-no-verification_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-lucky-patcher-hack_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/free-minecraft-coins_GM479516143.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/synapse-roblox-free-download_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/minecraft-free-games-no-download_GM479516143.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-change-your-roblox-username-for-free_GM431946152.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-cheat-free_GM406889139.pdf
    • http://juscor.com.br/ckfinder/userfiles/files/hacker-told-me-how-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005424.bin
7836d43c33cffc3b0b5fa9568a49bab25cc1beee8dbd7a641b054d6e833aa096		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5424 25136 bytes
font_01_sfnt_off00008dc6.bin
fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC6 2836 bytes
font_02_sfnt_off0000976c.bin
2f6ca778f9003cd574b676aa8fca18793d2165ed0870447bf10c47f3a954ecbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976C 18912 bytes

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