Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf33a42041a9b97…

MALICIOUS

PDF

40.7 KB Created: 2020-10-19 00:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eeca67c8b0b7f962748b8ed39a70c981 SHA-1: 71dd526c2125465e44a7554c5ca93864c3ac2af3 SHA-256: 3bf33a42041a9b97798b91789585fd46ed8ad389ca10092b1455ab32a9d6613a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs suggests an attempt to redirect the user to malicious infrastructure, likely for phishing or malware distribution.

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/123?keyword=5th+grade+math+test+and+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f8952a5a75a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f8738a986b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f88f0d8eed96.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/3e75a4e696b2f2d.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/1d1f8ecc085ca.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/4740979.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7904132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f8a9aa431927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f892144d0ff5.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/64722d3.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/6069273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f880ff1af0a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f871cf1be6ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f87652f7651c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8cb44eab36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8ba76ae52a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f8b07f7ddacf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f890d7137c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f87ad6bed15d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED3 5544 bytes
SHA-256: 545a4db2474cd19aa3c1f053875dd6934f9ac912cd936bb6cec78911e386c8ef
font_01_sfnt_off000071a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A1 10660 bytes
SHA-256: b7476c34a97f2ad3545533cee7323b0124e597fc0a21ebffebd110048a082bc9

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