Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ace87cfc9c2ef1…

MALICIOUS

PDF

36.0 KB Created: 2020-08-29 20:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b40ad3ac1678e998aaffda0724d0d24 SHA-1: ee97d3acc3cfd6492143c959e5ed6cc8ba023be4 SHA-256: 91ace87cfc9c2ef17be2e37881bf5ac24f112ec545321d7f642d4fe40350942d
120 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 obscure malicious destinations or to engage in SEO poisoning. One of these links, https://ttraff.cc/wix?keyword=sonic+oc+sprite+sheet, is flagged as a known malicious redirector. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not a typical user-facing document but rather a container for malicious links.

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.cc/wix?keyword=sonic+oc+sprite+sheet
    • https://static.usrfiles.com/ugd/b8c837_17394378c2454fe4af15017234932237.pdf
    • https://static.usrfiles.com/ugd/f80014_5aaa862cc2ec40788862536a63db54a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ce7df141ee543ad95be663f69fcede8.pdf
    • https://static.usrfiles.com/ugd/b8c837_729d691f03ea498285c983a66500103a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b288ac6bcf0459cb27a8fc8b7ab4637.pdf
    • https://static.usrfiles.com/ugd/ae15ca_34ba79bffad54d61b5b7e5e65f76bafb.pdf
    • https://static.usrfiles.com/ugd/89064d_512854164ec24c94be6aa2fc85ec018c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f0279d878754f349b37f2087bf532c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_80fc8956b0284f16be8a7e13681e53e2.pdf
    • https://static.usrfiles.com/ugd/6290de_16309f3201fa4ccdb59fb884a410a3b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_09e163782efa4afaade876bacddeddee.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/central_pneumatic_3_gallon_air_compressor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/vekonoxudumutex.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/mcgraw_hill_teas_v_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/32986268160.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/16015756464.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_off00004fad.bin
4fa2f1880b6c80b3672583943a3596d297160c41a228bcfe71137123722b04fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAD 4880 bytes
font_01_sfnt_off00006037.bin
f3d5a5a27261bdb908a7f588aee9f5a417ead34a00da9e401b7df68baa823e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6037 10348 bytes

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