Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4f70201cd8675c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 03:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c1f38919e2c2a050382042c40834b4 SHA-1: 80a89c10105a426de707fff2342c85265434626e SHA-256: 4c4f70201cd8675ced20b4e2b415c61c91b1f83142441d2a42adba1bf59ca6a1
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used to create link farms for SEO manipulation or to distribute malicious content. One of these links, https://ttraff.com/wix?keyword=love+and+logic+pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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.com/wix?keyword=love+and+logic+pdf
    • https://static.usrfiles.com/ugd/87a178_37c241a84e4643a3a4eb6dd719b7fffb.pdf
    • https://static.usrfiles.com/ugd/cc03df_7de1235c9b574c219ea008af7ac9ef69.pdf
    • https://static.usrfiles.com/ugd/d55797_d34bb2f3e9704e9da4b86bcaa64543fd.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/fuzijewupamefapapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/13785082810.pdf
    • https://static.usrfiles.com/ugd/c63dba_5bf8e6e2a85b42eeb74f87846463a8e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3382137978224093a2596f2a0e44a9c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c051c2ad37c547e49deeae9af09b1a8c.pdf
    • https://static.usrfiles.com/ugd/b7082a_57f0a87204d34ea1addebc7a89c62655.pdf
    • https://static.usrfiles.com/ugd/4b874d_9adf58eb2a514292903c434c06aa1eaf.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_off00006636.bin
12aad321497ed8f94d397207ad52993210eb47712d071b0bc0d756e87fed7e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6636 5052 bytes
font_01_sfnt_off0000778a.bin
10f8b105e67b0c0ac8e755055ea05d097948f6ead475fbda299ac07935891c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778A 10652 bytes

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