Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cf324b8477e91d…

MALICIOUS

PDF

36.1 KB Created: 2020-08-30 13:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af46d53b711565b8aa356c60cf2200d0 SHA-1: c6b75f6f258e47d386fdc6a996a89cc707544442 SHA-256: 52cf324b8477e91d39f9effbcdf5722a13efd13f76efc67bd5ed41d1d614fefb
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though corrupted, contains keywords related to the malicious URL, suggesting a lure to a specific product. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=plafond+autoportant+leroy+merlin
    • https://static.usrfiles.com/ugd/b8c837_c4b27a19a9c04f3e986963b242c21e9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d92458ecee1c45c6b35af5bffbd129bb.pdf
    • https://static.usrfiles.com/ugd/f1780b_50b1d2742be5443c9768f856c1a956a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c283542dd054f8287c4545160b60715.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/manual_de_planos_arquitectonicos.pdf
    • https://cdn.shopify.com/s/files/1/0435/5614/3265/files/bonopuniwapivumimufat.pdf
    • https://static.usrfiles.com/ugd/83f04e_99e8f5867b0c4947a731ad9c14351ce8.pdf
    • https://static.usrfiles.com/ugd/158fb9_925faa6130dd4258818dbb11f5f4e406.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5f60f4ae5f4bd284098d999c42e049.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1144/files/dozukutobedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/brain_parts_worksheet.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_off00004e54.bin
7d3b31fd1211cfc376e6771e3d5c01d773350d5e035abae8e10e197519c38a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E54 5112 bytes
font_01_sfnt_off00005fae.bin
cfc06d8d10077a56185d4d29995d62eeff9938aba54e61aef8b23c9ca1d28de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAE 11328 bytes

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