Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac753c5945b94286…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 19:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b739a1b05341130bce81361e3cd6adb SHA-1: f50d3cfd03a16146d0d1d58c0370514a43830a6a SHA-256: ac753c5945b9428618250b3e914cc4f9480ee3cdaf174cf00ab5ecb17e4e4b66
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous external links, including one to a malicious domain, suggests a link farm or redirection attack. The ML classifier also 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.com/wix?keyword=present+simple+tense+vs+present+continuous+tense
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/warehouse_management_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/31431402133.pdf
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/84470319330.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8918/files/ximakekalusibinomenimita.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/1074188999.pdf
    • https://static.usrfiles.com/ugd/d1c05f_7f55798287c54ddda0cb03458d1bfea8.pdf
    • https://static.usrfiles.com/ugd/4ae4db_104174892d04400d9b4ceaac5b479bfb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/64524198655.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/86289083784.pdf
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/zixowefel.pdf
    • https://static.usrfiles.com/ugd/b8c837_29a090987f744b1386a6e3cbb6ec773c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b494aee22bf24c66a2f01cbaac0af754.pdf
    • https://static.usrfiles.com/ugd/b8c837_13cff52808c341408d9d2ff4f2ff97d2.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_off00005cf8.bin
da55e94d23679876f3696461e2e2e4bbe7ddd74e04151a123262407687d82934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF8 4928 bytes
font_01_sfnt_off00006da6.bin
835d43bbc37857aa07e78c974878b98a11e517ba500069c52fb1eaee0152deb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 10060 bytes

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