Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b848bd794d64e02…

MALICIOUS

PDF

42.7 KB Created: 2021-05-17 22:08:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 91ecbc9a37f0b6c3e4f631058830acc6 SHA-1: c69b2bc1f703effd070bd07106585cbb5821f0a1 SHA-256: 8b848bd794d64e02fa81194efc9cb2ab4af42682dc11681a6fc3a262e160d44d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are related to game cheats and free downloads, indicating a link farm or phishing attempt. The presence of a direct URL to a Minecraft hack download and the ML classifier flagging the PDF as malicious strongly suggest malicious intent. No scripts were extracted, but the document's structure and embedded links point towards a social engineering attack to drive users to malicious sites.

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/479516143/minecraft-education-edition-free-game-hack
    • http://multiconfianca.com.br/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/coin-master-free-spins-glitch_GM406889139.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/free-minecraft-servers-to-join_GM479516143.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/how-to-hack-roblox-on-mobile_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/roblox-hack-2021_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/robuxy-com-free-robux_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/free-private-server-roblox_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/instant-free-spins-coin-master_GM406889139.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/500-free-coin-master-spins_GM406889139.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/minecraft-free-download-linux_GM479516143.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/win-free-robux_GM431946152.pdf
    • http://multiconfianca.com.br/ckfinder/userfiles/files/roblox-hack-tool_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bfa.bin
6cbd3c7981d3adbce453c5d7c48f5c139c25c428f8d71f8ac173c5df3bc18e48		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BFA 25140 bytes
font_01_sfnt_off00008541.bin
50b2d5ff22f0b3ffa840834f12cbec9953eabd3c4e347b5eb6eb3aff22325aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8541 18024 bytes

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