Malicious PDF — malware analysis report

Static analysis result for SHA-256 9347cd38e449d5eb…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 10:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4dfae12ea1a1eb6cd907c4e074d43bc SHA-1: 3a0bb40d696feb358ca581c7a3e9c9460ab3d75b SHA-256: 9347cd38e449d5eb5ccfa45a5edb61ab211d7a20854154e1aaa7d6d85badff78
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding. The presence of a large number of embedded links, many pointing to static.usrfiles.com, suggests a link farm intended to distribute malicious content.

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=bye+bye+t%25C3%25BCrk%25C3%25A7e+kitab%25C4%25B1+%25C3%25B6zeti
    • https://static.usrfiles.com/ugd/b8c837_6019ff8e958f41e58820a011ac57f7fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a4f14071a4c426f88c4eb5238b1e70f.pdf
    • https://static.usrfiles.com/ugd/b8c837_25905f369a5344ee9f6c6aa81377c426.pdf
    • https://static.usrfiles.com/ugd/b8c837_c58d8df523b14f43acf75b7ae7f7cb34.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1edcb8a83c94dfea2c829b95e17ac54.pdf
    • https://static.usrfiles.com/ugd/b8c837_03b346ecdfe244d6a691f349a32ad0e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f85d765a816a4ec080ce057d9bc9f162.pdf
    • https://static.usrfiles.com/ugd/b8c837_b34d500d95844267aa7a0fb2f1b9653a.pdf
    • https://static.usrfiles.com/ugd/b8c837_56f9e3dc007b4eee92cd0441266ca5ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_165fb73706fe412c814ff61381b9a175.pdf
    • https://static.usrfiles.com/ugd/b8c837_871ad658586346a9b5ffea189f1e0c97.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/16641824758.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/totosofegenonitokiwuzaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/2054/0310/files/viwedulixojudanag.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_off00005914.bin
22ddaa2f072fb4596ecd9165dafdc509940fcc67b28fa47fa12a532987156ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5914 5348 bytes
font_01_sfnt_off00006af6.bin
607ea0acf8c158aaebc73bc4a09af198d1db218c5d0a669b6b93ff922200054d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF6 11388 bytes

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