Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3424dc56e5a499…

MALICIOUS

PDF

42.8 KB Created: 2020-08-05 10:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4508fe878cbce91dfa4344e896d577f6 SHA-1: c85b3bef28559e06d0472c3601c0f1209cb2921a SHA-256: 8e3424dc56e5a4998d8cf091c9f71d6512fa02cb870c8834cafaff88c02ebeda
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, pointing to a redirector service. The primary malicious URL is https://ttraff.ru/pify?keyword=pleural+effusion+etiology+pdf, which likely leads to further malicious content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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=pleural+effusion+etiology+pdf
    • http://files.hantverkgalleri.com/uploads/1/3/1/4/131437210/tefuzibubafa-jejeperaro-setidaruzaremoz-wajadafozipopa.pdf
    • http://files.9-r.com.au/uploads/1/3/0/7/130739533/sovizex-zanawoten-jajizanovit-vubajavifoxisi.pdf
    • http://files.glorytourssalalah.com/uploads/1/3/1/8/131856392/11416cf14.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/labezoxejazidan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17810153535.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/luwokikapinolaravopako.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/60268503448.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/47727176603.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/jusawodibofaguzixazemov.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/60437618665.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/begegutuxozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/perir.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/42944929433.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/rorewedebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/77075263620.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/12480338740.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_off000069bc.bin
21551879d78effe1ae2d17d285c3c4b6957bc2fb15445daa85a756405ae2d41e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BC 5312 bytes
font_01_sfnt_off00007be6.bin
6238e3ec23a541a29e1521d57eca457feca3c8b3dbaa7aa0ce43b76bcf37105a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE6 10112 bytes

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