Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ffd6915b02892c…

MALICIOUS

PDF

35.7 KB Created: 2021-07-09 08:45:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9cd13d36669cc1f909964d77e3b98b7d SHA-1: efd9ec2a56bded89b864b78cc1581a7c00526963 SHA-256: d6ffd6915b02892ceceef1bf839fc3074e00e6413ab06a747942c42f70631167
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are SEO-optimized and point to websites offering 'free Robux' or game hacks. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

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/how-to-get-free-robux-2021-no-human-verification-game-hack
    • http://www.manchieu.vn/upload/editor/files/roblox-mod-apk-2021-free-robux_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/roblox-points_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/roblox-2021-hack_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/free-robux-gift-card-generator_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/how-to-get-free-robux-using-hackbar-extension_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/minecraft-pe-texture-packs-free-download_GM479516143.pdf
    • http://www.manchieu.vn/upload/editor/files/free-robux-no-human-verification-or-survey-2021-on-ipad_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/free-spins-coin-master-daily_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/minecraft-story-mode-free_GM479516143.pdf
    • http://www.manchieu.vn/upload/editor/files/how-to-hack-funnehcake-on-roblox_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/roblox-cheat-engine-speed-hack-2021_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/300-daily-free-spins-coin-master_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/roblox-promocode-hack-script_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/counter-blox-roblox-offensive-hacks-v3rmillion_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/free-robux-glitch-2021_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/coin-master-hack-2021-android-apk_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/free-printable-minecraft-coloring-pages_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003262.bin
a0de963945c613335715897b4a73647f8f0acb4f97205aa7e23c9f0e6c78d334
pdf-font-stream PDF embedded font (sfnt) at offset 0x3262 22264 bytes
font_01_sfnt_off000063d8.bin
73ca12d001f484cb7e916eddfb38cb68c81d0268ac20e02f4c1cc4bb789b0b63
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D8 19900 bytes