Malicious PDF — malware analysis report

Static analysis result for SHA-256 af56160be614f8dd…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 05:55:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 594d32cdb53c6d329f3229110e8b7112 SHA-1: 0f26940e24a05b2f9cc4ec46ff5333c150230910 SHA-256: af56160be614f8dd8479fe90f8c81a9c5e55398285afc30c89620182dba444a5
102 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are disguised as PDF files, pointing to websites offering free in-game currency or accounts. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, and the 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to click these links. The ML classifier also flagged this document as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-online-generator-for-coin-master-game-hack
    • http://ggmtc.net/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/pokemon-go-free-6th-gen_GM1094591345.pdf
    • http://ggmtc.net/userfiles/files/arsenal-hacks-roblox-2021_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/roblox-one-piece-pirates-wrath-hack_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/only-you-little-mix-cheat-codes-roblox-id_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdf
    • http://ggmtc.net/userfiles/files/coin-master-free-spins-for-today_GM406889139.pdf
    • http://ggmtc.net/userfiles/files/free-roblox-accounts-with-obc-and-robux-2021_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/free-robux-generator-only-today_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/roblox-shirts-and-pants-free_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/robux-hack-me_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/vesteria-strength-hack-roblox_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/free-robux-website_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/www-roblox-robux_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdf
    • http://ggmtc.net/userfiles/files/free-spin-link-coin-master-today_GM406889139.pdf
    • http://ggmtc.net/userfiles/files/pokemon-go-free-download-ios_GM1094591345.pdf
    • http://ggmtc.net/userfiles/files/dowload-hacks-for-roblox_GM431946152.pdf
    • http://ggmtc.net/userfiles/files/free-robux-websites-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003016.bin
ff10f797d5bf4873e049dbcf5f7de299be218cba67cfbbaf581f9c12e10f1909
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3016 22544 bytes
font_01_sfnt_off00006254.bin
9b9ca6a1ebabc5184410020ce6f00603c34c06d6c59453e1e72546e3244d6c52
pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 18072 bytes