Malicious PDF — malware analysis report

Static analysis result for SHA-256 80869105447ffd03…

MALICIOUS

PDF

37.7 KB Created: 2020-07-29 07:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b4efb2381b7e21680eff849f00657a SHA-1: 6a7fbeb18b3520274f5d2a08ac9ad9cb35d80125 SHA-256: 80869105447ffd0338740940710c76aa3fd1ae7744c3ffc1f9483468c893406a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=advanced+mathematics+precalculus+textbook+answers'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and embedded links point to a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=advanced+mathematics+precalculus+textbook+answers
    • http://files.ox-fest.org/uploads/1/3/1/4/131406275/9671805.pdf
    • http://files.debbieleejewellerydesigns.com/uploads/1/3/0/7/130739652/8abb37085.pdf
    • http://files.hardemanschool.com/uploads/1/3/0/7/130775528/toborofajipoji_nupigovi_dakaxo_mowekeruse.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/10534550347.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/84622089662.pdf
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/mavak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2860038855.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/ligepog.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/guvut.pdf
    • https://cdn.shopify.com/s/files/1/0440/0830/8886/files/fasinadebutefogojanoxawa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1771/5361/files/taxalatovefesa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/mipuluvivafebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/60263788448.pdf
    • https://cdn.shopify.com/s/files/1/0435/6413/8651/files/24726832002.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/81158480140.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/xewikefisimob.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053ce.bin
4d215fd062c472ca46d020adcbb56732658e2a7fc578ae4e3c2d4084fcd0c3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53CE 5608 bytes
font_01_sfnt_off000066b5.bin
99539a473f12fe20837d77d06e0f6a753ed9ebcc89212639b9b3480e2d45ee79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 9864 bytes

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