Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b68f3f26dbdb570…

MALICIOUS

PDF

42.2 KB Created: 2021-05-17 09:46:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c1e9a72f5de78282ec6170ede2ee2162 SHA-1: 9009ee1a4e5219babe6a31a082ac59b1be712dfb SHA-256: 8b68f3f26dbdb57035256e913dd7ae8f60e32776d1a111a7369fdbd44e93ac6b
94 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which point to other PDFs hosted on the same domain, indicating a link farm. The primary lure is presented as 'Free Minecraft Skins Java', but the actual purpose is to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 3

  • 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.
  • 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/free-minecraft-skins-java-game-hack
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/easy-roblox-today_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/minecraft-free-games-no-download_GM479516143.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-hack-apk-facebook-login_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-robux-group_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-code-for-free-spins_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/moon-active_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-free-spin-ml_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-robux-no-human-verify_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/coin-master-daily-free-spins-haktuts_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/bloxpage-free-robux_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/wwwcoin-master-hack-game-download_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-spins-for-coin-master_GM406889139.pdf
    • http://greenpalm.com.tw/uploads/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bd9.bin
9a5d42d8d018a4ae4a146b5a63264c3113f872682863afdad4eafb488288c142
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD9 24520 bytes
font_01_sfnt_off0000841d.bin
972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
pdf-font-stream PDF embedded font (sfnt) at offset 0x841D 2820 bytes