Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e400aeb34ab2f1e…

MALICIOUS

PDF

40.7 KB Created: 2020-08-01 23:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc544a022b49825a3625faf679f00a16 SHA-1: e5e4bcc5367449e10774440c589dafd934616cd2 SHA-256: 9e400aeb34ab2f1e46eb6947513d983f59fff924397aa6a20c32cb424e307a01
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 of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is presented with a deceptive query parameter related to Google Sheets. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document.

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=google+sheets+sort+by+date
    • http://files.liveeslnearyou.com/uploads/1/3/1/3/131379477/gigorife_nodad_lafoxewak_vuxokuramonegek.pdf
    • http://files.myrnaburksfineart.com/uploads/1/3/1/4/131437778/e591c.pdf
    • http://files.i-a-m.tk/uploads/1/3/2/8/132815785/8584661.pdf
    • http://files.epeecow.com/uploads/1/3/1/8/131856186/1228364.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1336/files/48080291582.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/35317855359.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/eu_to_rf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/98393636846.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/22328516754.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/83215034582.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/98443598005.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/41355072601.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/moxob.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/c_overload_assignment_operator.pdf
    • https://cdn.shopify.com/s/files/1/0435/5670/0319/files/50195868173.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/2812224212.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_off000060fc.bin
019a09cc67c99d0cd6ff6d821c1672b50fa31d4cbb471d82aee2aa9130029c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FC 5360 bytes
font_01_sfnt_off00007336.bin
57dd4ef96f202ce46ee07602ce3f4e4bff13fe5468b41ad79338d3a6e9a82aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7336 10180 bytes

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