Malicious PDF — malware analysis report

Static analysis result for SHA-256 085f04e93a7c5c6e…

MALICIOUS

PDF

46.6 KB Created: 2020-08-06 07:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 079b0f7f93896ceafe6d8eb12e448284 SHA-1: b1a521457f14460732a4f8798cca6023cd934da1 SHA-256: 085f04e93a7c5c6e1402b0f94c967dfa097adc2c1c5185137263a4105fa8c432
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=deductive+approach+definition+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded URLs 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=deductive+approach+definition+pdf
    • http://files.skramstadprimitives.com/uploads/1/3/1/8/131856184/ee0bf22e.pdf
    • http://files.corolib.com/uploads/1/3/1/8/131856065/juvosip_lezok_fegevewobumuban.pdf
    • http://files.patrickquinnartist.com/uploads/1/3/0/7/130739117/fujinuropowinewerun.pdf
    • http://files.pegspoststroke.org/uploads/1/3/0/7/130775792/tuxuba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/the_idle_class_game.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/57464943649.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5474/files/fibisorulegemavojul.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/66343681742.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/pituwul.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/fupejigunavejomuga.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/duvoxijebi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.pdf
    • https://cdn.shopify.com/s/files/1/0428/4533/9814/files/95115416853.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1958/files/64103041126.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/refaxanuvotuleferupapuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0746/files/74384229580.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/72075595670.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_off000079a4.bin
f15ce63d9d859f2b4102810a191d6b9d80a218a1c02b382fa9bf2f2c947be0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A4 5092 bytes
font_01_sfnt_off00008b05.bin
5ca383d7fbe3aaead656f7a831e7ba2f22bea0eef42945bd0c805b0fbd7554d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B05 10088 bytes

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