Malicious PDF — malware analysis report

Static analysis result for SHA-256 39afb19dfc8f5f9d…

MALICIOUS

PDF

45.6 KB Created: 2020-11-05 10:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0a98830c593a421cb2778d77746e7eee SHA-1: 1da0d22b0c15e4bd5a78f061bfd77df4a2e3f293 SHA-256: 39afb19dfc8f5f9d2e8676a1e54ba35c8d483cd3e8e1124845932bf8d159fc36
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lure users to malicious infrastructure. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

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://gettraff.ru/strik?keyword=bad+news+letter+closing In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_5f971cfa5d446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f97ebab1cc97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5f92b67f118dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f8a79779bf45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f8f527e2af08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5f8daf035307b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bunobu/vemupawububerarisole.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/big_brother_live_feeds_free_bmx_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/jebukiralizit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3028/0864/files/vista_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/mirom.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/pogelibawel.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/zefotoravomug.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_off0000767d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767D 5248 bytes
SHA-256: 6e9cc7262aaa4143a39b6cc8da2facdad1f9432ed495ea3357daf2fcf7df4e4f
font_01_sfnt_off00008876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8876 9836 bytes
SHA-256: 661c5bbf213bb5e5dd60dd85f5265988c9176c303f0d71c50452e779ee226a7a

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