Malicious PDF — malware analysis report

Static analysis result for SHA-256 5191ba832292f809…

MALICIOUS

PDF

52.6 KB Created: 2020-10-01 00:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0a9bcd5eb559078cfc45dba4dc63ead5 SHA-1: df0cadc41bfaa6d7ff5203f66cc0e5d66433e980 SHA-256: 5191ba832292f809e5a79db48d8183672e6e325283e1322fdc0f8f59db52addf
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 external resources, forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/strik?keyword=radiation+heat+transfer+book+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to PDF documents and URLs, suggesting a lure to download or view content, which ultimately leads to malicious sites.

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://ggtraff.ru/strik?keyword=radiation+heat+transfer+book+pdf In PDF document text
    • http://moluteg.southerngrowers.com/uploads/1/3/1/8/131857920/segibanajivub-vifodula-vafovap-dulilulumamexi.pdfIn PDF document text
    • http://files.act-lab.net/uploads/1/3/1/8/131856134/e4c718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecf10b2-373b-4187-8bac-2ee3bb1fadef/1636500649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6893621-c958-4916-b161-d67cc1eea1e6/99927257849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca6ca05-090d-4eef-93ce-5407978e42ca/mugebizeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3769/5906/files/digafamumixomagufubas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/16819790422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/0285/6346/files/16588225342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4397/0463/files/xavenazerowavowijusifuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050fe8eb-833d-4cc9-a68a-f534deafe2b9/91907814556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8414747-f03c-475f-8f97-ff4b1aa8c7b2/fowumoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798e1417-7ebb-4049-a565-d2ad4c974f63/dalowevudokime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5eddd8-2e2a-4280-99c1-e4ab2ecb4bfe/jefoxiwusifanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6045585a-b77e-4acb-ad85-b1533c0b2208/jivaxad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9121 5308 bytes
SHA-256: ce37f5f60e5f25a42eddf2dd12b20520b99c8ec655d8634617e216b103ecb3be
font_01_sfnt_off0000a325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA325 10052 bytes
SHA-256: 81ffd163fd871479d7168d981c7ff55cc29158494759362e2282398a570d128f

Open this report in the interactive analyzer, or submit your own file for analysis.