Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc473d2795b3e1a…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 11:48:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6f0b546317ee79442524ddf868d41e22 SHA-1: 0d07b4f99b2bdab7ee01262f8adeb80d67be09e3 SHA-256: dbc473d2795b3e1a02c8c88a32f4fe0e6225d3cd4486d5e4116108ed27892c32
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO spam tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a 'download button' heuristic further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/how-to-change-your-name-on-roblox-for-free-2021-game-hack
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/free-coins-coin-master-no-human-verification_GM406889139.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/hackear-coin-master-sin-root_GM406889139.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/can-u-get-free-robux_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-hack-an-roblox-account-2021_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/free-robux-master_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/free-robux-websites-2021_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-hack-no-human-verification_GM406889139.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-get-free-robux-games_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/best-roblox-hacks_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/roblox-free-wings_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/free-robux-com-2021_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/fb-coin-master-free-spins-link_GM406889139.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/free-spins-for-coin-master_GM406889139.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://www.marvelorlubricants.com/uploaded_files/userfiles/files/coin-master-free-coins-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000552d.bin
2a85ba9827e31abdbff86b575201fc55af86c3791809e468a005939545790211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x552D 26208 bytes
font_01_sfnt_off00009158.bin
2bf0f83bdbf57a62fff67313d8bda4267a1de33aa633ecaf11b3992f56ff6b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9158 19756 bytes

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