Malicious PDF — malware analysis report

Static analysis result for SHA-256 d652ba2cc075d343…

MALICIOUS

PDF

48.2 KB Created: 2020-08-31 05:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 982628f25cebd2101d88fafb27d65c87 SHA-1: 784da3fc2e6a48370c6bd8d28219971d51ed4bf9 SHA-256: d652ba2cc075d343d4850375e173a4a274a720d99dc2add8c2c80d31d9ef0f98
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=the+good+witch+season+guide'. This link is embedded within the document body, suggesting an attempt to trick the user into clicking it. The presence of a large number of external PDF links, many hosted on 'static.usrfiles.com', further indicates a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.ru/wix?keyword=the+good+witch+season+guide
    • https://static.usrfiles.com/ugd/b8c837_e0c3c45da79249788ec0ee31b601bc21.pdf
    • https://static.usrfiles.com/ugd/b8c837_95984a5f735046ce9fcdf2916bf839b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_16479d6eafdc437fa583bb2210179fda.pdf
    • https://static.usrfiles.com/ugd/6908d7_9aea3e5bbf954994826755668857057f.pdf
    • https://cdn.shopify.com/s/files/1/0446/6691/2921/files/93590040760.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/movimiento_ondulatorio_problemas_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/39363005252.pdf
    • https://cdn.shopify.com/s/files/1/0431/7587/0630/files/movesizajutavef.pdf
    • https://cdn.shopify.com/s/files/1/0446/1946/4867/files/bulking_workout.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/google_chrome_manager_for_pc.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f07abd4e94e4775beff56f609c3000f.pdf
    • https://static.usrfiles.com/ugd/98857b_e46d18ff3e7745cfaa9a39034fe3d0d6.pdf
    • https://static.usrfiles.com/ugd/c3f88d_3883f2dc80964b1d9e32b8d0f9d1584d.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ef7.bin
2d655313893cb16d8adacfb978b87f531b2c4176c190a5ffcd1461adaef9eb62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF7 5112 bytes
font_01_sfnt_off00009073.bin
2b7cbadd97253dd85bffdff583c257d85d89e86a891b4061d5bb2ca62e93b66e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9073 10496 bytes

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