Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b76925c9ac329ba…

MALICIOUS

PDF

40.4 KB Created: 2020-08-03 05:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b585dc23256bfb6a807a75381cb0e67 SHA-1: faa599c2321a55a57730e16e7713329d40b70baf SHA-256: 5b76925c9ac329ba3ed7d0d51705f2e5aeadfc0ab5440de7026c19fcbd496933
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 external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent link redirects to `https://ttraff.ru/pify?keyword=rogawski+calculus+early+transcendentals+solutions+manual+pdf`, which is flagged as a malicious redirector. The document body itself contains garbled text and references to 'wkhtmltopdf', indicating it was likely generated programmatically to host these links.

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=rogawski+calculus+early+transcendentals+solutions+manual+pdf
    • http://files.patientmind.org/uploads/1/3/0/7/130775265/8274594.pdf
    • http://files.happyhomevegan.com/uploads/1/3/1/1/131164048/f2fb5dd3c08ca.pdf
    • http://files.stpaullutheranhartley.com/uploads/1/3/1/8/131871390/webemanizid.pdf
    • http://files.highlanderteach.com/uploads/1/3/1/4/131407635/ruwado.pdf
    • http://files.littletownbakeshop.com/uploads/1/3/1/3/131379406/wudatujeweruj_rewusokuru_zagusador_mitidumaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdf
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/wotafur.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/47501595657.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/43704356281.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/91469598761.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/quest_diagnostics_requisition_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8892/files/bavagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/4585954034.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/xegabuvolulasow.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/zitawoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1714/0386/files/euro_pick_up.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/44425995327.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/bojiraximabefagexovole.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_off00005ced.bin
ac318c23d64c3a536b556e3b3da244e1a6c7cf1ebca804d084358ecdc7908fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CED 5740 bytes
font_01_sfnt_off00007091.bin
b1149e60419d16ee51c85d1a1203f6a2547b7e44ade0b7d5aacab78098361f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7091 10228 bytes

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