Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61b2daa0998cc9e…

MALICIOUS

PDF

41.7 KB Created: 2020-08-04 08:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a031470ae1c8a1acbefcfda12af3af05 SHA-1: 8dc976d442bc46b51864bbfc00f763f964bedd3d SHA-256: c61b2daa0998cc9edd142839faa89f1eec67572ea10e53f1c42098a514618fe9
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to drive traffic to this malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=chicken+biryani+tamil+pdf
    • http://files.ashlandnaz.org/uploads/1/3/0/7/130739377/5bde19.pdf
    • http://mojenopop.dougdartsch.com/uploads/1/3/1/8/131871390/214815.pdf
    • http://files.lipsmonsherri.com/uploads/1/3/0/7/130739015/nafena.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/vitazipejar.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/31544766471.pdf
    • https://cdn.shopify.com/s/files/1/0440/4481/2438/files/tokajekow.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/morevidugikekuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/68058056560.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/5e_mystic.pdf
    • https://cdn.shopify.com/s/files/1/0437/1149/6347/files/kia_optima_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/85531222778.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1582/files/bevaguwutoka.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/gobipuzafuder.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/76997308661.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_off0000666f.bin
25cae5f693cdeda8a1ed19785af9b4c6d0da0780caa5162bd26859c9bbb6a286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666F 5428 bytes
font_01_sfnt_off000078bd.bin
ff1d88d59a20a24f489cf6bf30f3b39dff15fe63d1ad775079a624e24a1baeb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BD 9852 bytes

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