Malicious PDF — malware analysis report

Static analysis result for SHA-256 9802a0760b97b8f7…

MALICIOUS

PDF

39.5 KB Created: 2020-10-28 13:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c96f51695a8557eee92b461d318eab11 SHA-1: 239837256c984c71b2908c46ef39424e58bf24be SHA-256: 9802a0760b97b8f75b1759d20281ce1a7c2c0817705ad987413714bb04e5ad30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be directing users to external, potentially harmful websites, which is a common tactic 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://cctraff.ru/strik?keyword=yang+zhang+volatility In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f870f140d443.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/1240458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f98e51fbda96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f8b10de8c127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_5f94850ef1b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_5f94015f8efe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f97a4cdcaf93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f896c67b5809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5f94ff7ad3af3.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f8edb613271e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5f9093720197e.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/susopuzupure/tejifawajodolaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/68183038280.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/types_of_sorting_algorithms_in_c.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/83590136255.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/dawibezepuluvetigiri.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/fudedejijemodezinuwetoruv.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/banusid.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/80407432545.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_off00005c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C27 4844 bytes
SHA-256: a812b8a0a413e3d98f14a2f3ac53873a23a5b6e4408bf2265ad24902903f5e64
font_01_sfnt_off00006cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBF 10720 bytes
SHA-256: d2e33fcdc969c812e29abbe1a42de2994425ae9f00fb6509e85a4580c8cd7d20