Malicious PDF — malware analysis report

Static analysis result for SHA-256 3935cd6ecf0b6f30…

MALICIOUS

PDF

45.7 KB Created: 2021-05-15 09:35:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b8e56815f0c3175adc6ad33dcb59b0fc SHA-1: df3d30b1500137089151b890313b551b8cc398b1 SHA-256: 3935cd6ecf0b6f3090ad84ed584d051230a17e3b0698f9148263dd03a8a7b28c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which are part of a link farm, directing users to sites offering "free Robux" or "free spins" for games. The ML classifier flagged this PDF as malicious with high confidence. The presence of a call-to-action phrase further supports a deceptive lure to download potentially unwanted or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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-bedrock-free-with-java-game-hack
    • http://tileworld.com.au/files/how-do-you-get-free-robux-2021_GM431946152.pdf
    • http://tileworld.com.au/files/give-me-free-robux_GM431946152.pdf
    • http://tileworld.com.au/files/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • http://tileworld.com.au/files/buy-robux-free_GM431946152.pdf
    • http://tileworld.com.au/files/free-roblox-gift-card_GM431946152.pdf
    • http://tileworld.com.au/files/coin-master-hack-no-human-verification-2021_GM406889139.pdf
    • http://tileworld.com.au/files/www-roblox-com-robux-free_GM431946152.pdf
    • http://tileworld.com.au/files/coin-master-daily-free-spins_GM406889139.pdf
    • http://tileworld.com.au/files/free-spins-on-coin-master-iphone_GM406889139.pdf
    • http://tileworld.com.au/files/coin-master-game-free-download_GM406889139.pdf
    • http://tileworld.com.au/files/free-coin-master-spin-app_GM406889139.pdf
    • http://tileworld.com.au/files/coin-master-free-link-today_GM406889139.pdf
    • http://tileworld.com.au/files/app-for-free-spins-on-coin-master_GM406889139.pdf
    • http://tileworld.com.au/files/roblox-bloxburg-free-money_GM431946152.pdf
    • http://tileworld.com.au/files/roblox-arsenal-hack_GM431946152.pdf
    • http://tileworld.com.au/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://tileworld.com.au/files/coin-master-hack-apk-35-11_GM406889139.pdf
    • http://tileworld.com.au/files/coin-master-hack-app-for-iphone_GM406889139.pdf
    • http://tileworld.com.au/files/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://tileworld.com.au/files/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bb4.bin
bd8ed25bfe17c1763de3f2b36c0d861d9066ad6794c327f97c178c3ff112abfc
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BB4 25084 bytes
font_01_sfnt_off0000842d.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
pdf-font-stream PDF embedded font (sfnt) at offset 0x842D 2940 bytes
font_02_sfnt_off00008e3d.bin
4030f6649d0ebdd9f19ba86bdfab3d907e637ec7756e67114778b3c35e301262
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3D 18912 bytes