Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dec14ad2174cba…

MALICIOUS

PDF

34.1 KB Created: 2021-07-09 22:42:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ba3d276f5143e83d92cc84692813327b SHA-1: b2332004d42db53be00fcc8b7348b29fce2c55b6 SHA-256: 88dec14ad2174cba65de79bfdb97a828ad0e2ab547c1ed8ace92c71f92a43f1b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes free in-game currency and hacks for popular games like Roblox and Coin Master. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and ML_NYX_PDF_MALICIOUS confirms a high probability of maliciousness. While no scripts were explicitly extracted, the nature of the lures suggests an attempt to redirect users to download malicious payloads, likely disguised as game cheats or hacks.

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/431946152/free-robux-2021-game-hack
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-hack-spin-link_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/roblox-hack-download-mac-free-robux_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-easy-2021_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-spin-generator-for-coin-master_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/minecraft-story-mode-free_GM479516143.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/roblox-com-r_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-game-hack-version-download_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/roblox-german-flag-tshirt-free_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/free-minecraft-coins_GM479516143.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/You-can-export-only-first-20210-rows-available-for-your-subscription_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-heaven-links-free-spins_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/roblox-hack-build-a-boat-for-treasure_GM431946152.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/hack-coin-master-net_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-blog_GM406889139.pdf
    • http://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/how-to-cheat-in-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f9a.bin
7d5395c732e3e30c5ebe4f8fa53529b01b289e9f5177fcb490c2d57d9a9033f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9A 21820 bytes
font_01_sfnt_off00005fcc.bin
bd102244ffb40c6add567cd3640126a26b927334c4b0bdc73f6a542841550b4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCC 19116 bytes