Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0934573f3888e1d…

MALICIOUS

PDF

47.8 KB Created: 2020-11-04 19:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f32ee8a2fe26cbfda816b202774d61fe SHA-1: dcfbbc68526fa326516b17b30f95a0acc11cd165 SHA-256: a0934573f3888e1d8178aea47c040830c7974334a32710f1301e1eb6d8729cd5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://cctraff.ru/strik?keyword=once+upon+a+chef+maryland+crab+cakes. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous external links, further supporting the malicious redirection intent.

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=once+upon+a+chef+maryland+crab+cakes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f885a5e66d28.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/pisiwerewidivo.pdfIn PDF document text
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/palumifodopusuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_5f9d90022ac46.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/didezerug.pdfIn PDF document text
    • https://gijakumode.weebly.com/uploads/1/3/4/3/134306186/5701145.pdfIn PDF document text
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/pereluvuxako.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/fizup/risk_management_in_islamic_banks.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/indian_civil_law.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/tolik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4764/7894/files/bunirofuradow.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/58779598831.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/60045186807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfa1fab-113d-4f70-bb17-8301a375c218/lebevovojizipenibodax.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_off00007922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7922 5728 bytes
SHA-256: cd996b3fcbed166430a2a1797db037abff37c8affafea47ce75f343e56437e40
font_01_sfnt_off00008c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7B 11028 bytes
SHA-256: 8ef75cc39ce96223ebd13568ece284c4daf222671d2c28c21908a9b1916ff3dc

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