Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bbe53f0f42eaca…

MALICIOUS

PDF

40.7 KB Created: 2020-08-27 21:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa4b8821658bfe3b8825aee1e73befbd SHA-1: 26757e522a26784a618f4b771c911f396c9fd5c7 SHA-256: a2bbe53f0f42eaca358ce24a715257c27da765544e6f34c4d4fa23d7e578fd77
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves leveraging these links, likely for SEO manipulation or to redirect users to malicious sites. No scripts were extracted, limiting the analysis to the PDF structure and embedded URLs.

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.club/pify?keyword=poarch+creek+indian+tribe+rolls+book
    • http://files.dallasavenuedental.com/uploads/1/3/0/7/130775747/703093.pdf
    • http://tuwusus.cnnfarm.com/uploads/1/3/0/8/130814297/buteni-fizov.pdf
    • http://timik.thecotswoldcollection.net/uploads/1/3/2/6/132696414/e53eef25.pdf
    • http://files.rachelcookcopywriter.com/uploads/1/3/1/4/131454109/8109267.pdf
    • http://files.irsoro-art.com/uploads/1/3/1/6/131606346/pepujopun.pdf
    • https://cdn.shopify.com/s/files/1/0440/6119/6440/files/wimat.pdf
    • https://cdn.shopify.com/s/files/1/0448/6037/5201/files/acing_contracts_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0282/8699/files/87685239692.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/cellulosic_fibres.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/59712177067.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/blinded_by_science_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0582/files/tajiwepogiwag.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4165/files/electrical_wire_size_chart_in_mm.pdf
    • https://cdn.shopify.com/s/files/1/0438/1900/8160/files/fagexaletodigoxoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/54987636789.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.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_off00006142.bin
04111f266d3ba6ac3b7c04a861830ce530e886cb2da16f11bd224ea9ebb05f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 5232 bytes
font_01_sfnt_off000072f6.bin
1b0f139e340c00ceb48c2cc68a66a3b2f6290d0b60e893e53dc7e328443bb490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F6 10256 bytes

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