Malicious PDF — malware analysis report

Static analysis result for SHA-256 23640847c8865fc6…

MALICIOUS

PDF

36.1 KB Created: 2021-07-07 13:01:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6ad61f1b61c143380cd42a5a22d83285 SHA-1: ab02909172c188edbf3b73168ef2eda5f1566728 SHA-256: 23640847c8865fc6133d9390d924e9bbdf8c750bad2857b405020cc5ed4e0769
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a URL pointing to a domain associated with game hacks and rewards, suggesting a lure for users to download malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious intent. While no scripts were explicitly extracted, the nature of the links and the document's content indicate 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/microsoft-roblox-rewards-game-hack
    • https://www.mentalhealthnow.co.uk/uploads/files/files/pokemon-go-free-mew_GM1094591345.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/hacks-for-roblox-219_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/real-robux_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/how-to-hack-robux-with-cheat-engine-63-2021_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/t-shirt-roblox-adidas-girl-free_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/pubg-uc-malaysia-murah_GM1330123889.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/ban-script-hack-roblox-pastebin_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-roblox-redeem-card-codes-2021_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/play-kill-hack-roblox-v3rmillion_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-spin-coin-master-today_GM406889139.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/earn-free-robux-on-roblox_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-murder-mystery-2-candies-hack_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/cheat-argent-roblox-vehicle-simulator_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-com-redeem_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-robux-no-verification-no-survey_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/pig-master-free-coins-and-spins_GM406889139.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-robux-no-human-verification_GM431946152.pdf
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-robux-no-downloading-apps_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034a6.bin
0549a58ebd34d63ea6c8bf6b14142b6173ddd00d5d35d81cca13c987cb90acf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x34A6 23172 bytes
font_01_sfnt_off00006754.bin
15236a9164adcceeeabc7c563dc8d3c1b4330ca6f2c8a0eb4af9903fd5553319
pdf-font-stream PDF embedded font (sfnt) at offset 0x6754 19244 bytes