Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f447e515d50618e…

MALICIOUS

PDF

72.4 KB Created: 2020-08-10 15:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0fd62779074792d75199fc98472d78 SHA-1: 9a1802f73a14aae2a9fe5562f56e6ae62b7c6975 SHA-256: 0f447e515d50618e398eac183817280bde45d709f486714bb1e9da19b2eafc96
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 a link farm designed for SEO manipulation. One prominent link redirects to known malicious infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports this assessment.

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=spivak+calculus+on+manifolds+solutions+pdf
    • http://files.polbacquet-photo.com/uploads/1/3/1/6/131636819/tevexedi_nurof.pdf
    • http://files.andrewbixler.com/uploads/1/3/1/4/131453053/ab784de509.pdf
    • http://files.frenchwithveronique.com/uploads/1/3/1/3/131384429/8485941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/ruxova.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/46060411184.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7799/files/gukevotulikexer.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1146/files/human_variant_5e.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/97296535059.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/66270324482.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/vomurenoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/caddx_turtle_v2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4349/4807/files/27560983444.pdf
    • https://cdn.shopify.com/s/files/1/0454/5613/0200/files/camscanner_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/louisiana_literacy_test.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/8034420331.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_off0000ce74.bin
3f23fb853aa8505bb6910f756e462ee80da5ced53f407c8be031c5b340179572
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 5432 bytes
font_01_sfnt_off0000e0dd.bin
06807cb01af99b3702746362d7f3af3a763fcb69c678f07e49bc821b8e43e249
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 16660 bytes