Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95ee95be081f8ab…

MALICIOUS

PDF

49.6 KB Created: 2020-10-04 00:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ef016afeb66e260b5605a2e452098936 SHA-1: d88aa86268f0d5b5174c5fe9799f025d9e46d857 SHA-256: f95ee95be081f8ab93e1d83dcb6ec19f2d1d42b23fffd72a05c1d72c4c4c7ebe
184 Risk Score

Malware Insights

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

The PDF file contains numerous links to external PDF files hosted on disposable domains, indicative of a link farm. One of the embedded URLs, https://cctraff.ru/strik?keyword=yeast+bread+crossword+answers, is identified as a malicious redirector. The document body, though heavily obfuscated, contains a reference to this URL, suggesting the primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=yeast+bread+crossword+answers In PDF document text
    • https://site-1038439.mozfiles.com/files/1038439/zepegenavujawinag.pdfIn PDF document text
    • https://site-1036938.mozfiles.com/files/1036938/54157519496.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/sepirotevibibupab.pdfIn PDF document text
    • https://site-1040512.mozfiles.com/files/1040512/tinepokirofe.pdfIn PDF document text
    • https://site-1041937.mozfiles.com/files/1041937/nefasogavawuluxatelaruja.pdfIn PDF document text
    • http://vonuniwo.peterson-equipment.com/uploads/1/3/0/8/130813458/mamavi.pdfIn PDF document text
    • http://letuwuk.searlneuropsychology.com/uploads/1/3/1/8/131857101/futafagusowalamizoli.pdfIn PDF document text
    • http://files.psms95x.org/uploads/1/3/0/7/130776739/lazogove-sedezedexamo.pdfIn PDF document text
    • http://mopokilo.ksguns60478.com/uploads/1/3/2/6/132695643/sutitarisijojiwuge.pdfIn PDF document text
    • http://sakini.creativitycards.net/uploads/1/3/1/6/131636734/27e0105c25c7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0067/1652/files/zopomezazejap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8187/5112/files/lunumurenilinunav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395af269-2335-4a15-a1c4-97c30d6bf934/25284574154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6cd7516-5f52-41c1-b3a7-2582bc687a4f/83864262733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc12db9-b4b4-4729-8fb8-3dabe27308d1/dukarorupogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272cedf7-fe47-4f26-ab4a-4236a1cef8e3/viniwilutozituj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99307d79-3b07-4856-a51e-85fca9d07f3b/50615778952.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_off00008406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8406 5092 bytes
SHA-256: 215246961a5f870e52849be7df32dcec436561650a854cbe42ca42f53481ad64
font_01_sfnt_off00009573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9573 10508 bytes
SHA-256: 737ef272ad5e0c83f89822b2a5455318b9f8518a10bbc203d89257c35f1937bf

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