Malicious PDF — malware analysis report

Static analysis result for SHA-256 2005745f7cb5c3f4…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 06:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25d51f02b95e63e945f42894aef70c6c SHA-1: ab09215c1b274f15835408334e889aef6bd874cd SHA-256: 2005745f7cb5c3f4275cc32b1992078ee89e3cd082e66c851ab2a64c9f97c6e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination. Another critical heuristic indicates a PDF link farm, with many links pointing to external PDFs hosted on Shopify and other domains. The document body itself is heavily obfuscated and contains some of these URLs, suggesting a lure or redirection mechanism.

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=lange+case+files+pediatrics+pdf
    • http://files.kristygloverportfolio.com/uploads/1/3/2/6/132682327/doxasaviraxozigil.pdf
    • http://files.iambornmade.net/uploads/1/3/1/4/131408344/6d58ecd94954105.pdf
    • http://files.evelynjuliabodywork.com/uploads/1/3/2/6/132682167/jikijivuf.pdf
    • http://zogewive.brandywine.tv/uploads/1/3/1/4/131408027/a450571.pdf
    • http://files.mypropertyquestion.com/uploads/1/3/0/8/130813592/lagufun.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/vuvuvanexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/javirepevelisejo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5354/6656/files/maths_olympiad_for_class_1_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/3886/7607/files/kitepomaretuzusejageja.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/astm_pvc_pipe_standards.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/apostrophe_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/1344/6564/files/72847754537.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/misasutikageveme.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7223/files/13867877720.pdf
    • https://cdn.shopify.com/s/files/1/0431/2363/8426/files/resenomakilozubuxor.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_off00006644.bin
6c5a2e4c8794efa393a2e84373c96a1f502339801c8914ce699d36961b95235a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 5264 bytes
font_01_sfnt_off00007839.bin
dd946436f4e6b241a772d80446c064ca77982f4859c7464b2c6ce434a659a169
pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 9896 bytes