Malicious PDF — malware analysis report

Static analysis result for SHA-256 1907602e0710fe9a…

MALICIOUS

PDF

44.2 KB Created: 2020-08-29 17:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8090b91a92e0addd732e2ccfd9dc4b87 SHA-1: c03a5e85e6f6cbbe670ac53d2b160462c7c68b82 SHA-256: 1907602e0710fe9a49d58428db85f5685d0a7632e65182287369d83c16cfe388
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. While no scripts were extracted, the presence of embedded URLs and the nature of the link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=materiales+conductores+semiconductores+y+aislantes+ejemplos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/maximum_strength_workout.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/59804171072.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8554/4089/files/63149272212.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ae4f811cf4746fdb013b52745dcf53f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1ecf845b4e84769b685920271feb4ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_378f41b42f414a37bd4cc1379b8527a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6c97b325978480dbf153dd2a6de8c26.pdf
    • https://static.usrfiles.com/ugd/e1d12c_98f96102387348a3adb54d2dcb57b7a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_33b8b1ddc8fa4cb188e0a9ae031b5a5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4c5a4c552b24ff7ade7d7a220749a44.pdf
    • https://static.usrfiles.com/ugd/b8c837_adea61c8211c435abd1ea1da55a77eb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_04eb9e0fcc4344748837390be136e3eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_531bfd49a313432182eb865a40269856.pdf
    • https://static.usrfiles.com/ugd/ac72e0_2b94bf2959914c95bdbd1107e1972316.pdf
    • https://static.usrfiles.com/ugd/b8c837_6212f1430b58437d84a577fc1e1c08ef.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e94.bin
8147e5447fc191ed02200b1676e6b514dcfb66ef6e1a4f3b6048dcb69c231807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E94 5404 bytes
font_01_sfnt_off000080e5.bin
a187976dd986fd628c23cffc4d210be1245c440e2fae877393bbcc2d1a3356c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E5 10520 bytes

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