Malicious PDF — malware analysis report

Static analysis result for SHA-256 95190d3773a89a86…

MALICIOUS

PDF

46.8 KB Created: 2020-10-11 10:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d1fa89ed35ce77c020f5943241e862c8 SHA-1: 80809bba1cbba5ecc88c6d82f8fb842e0af0bf2f SHA-256: 95190d3773a89a86c3bfa1f95a5a4c1b5aeb095a94d956ecc1ea3576eafb8ece
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at `https://cctraff.ru/strik?keyword=shadow+of+sancre+tor+bridge`. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=shadow+of+sancre+tor+bridge In PDF document text
    • https://site-1041086.mozfiles.com/files/1041086/44008013786.pdfIn PDF document text
    • https://site-1040317.mozfiles.com/files/1040317/jinexijakepojidirirek.pdfIn PDF document text
    • https://site-1038961.mozfiles.com/files/1038961/43833582910.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/29851628595.pdfIn PDF document text
    • https://site-1043765.mozfiles.com/files/1043765/42684727495.pdfIn PDF document text
    • https://site-1038334.mozfiles.com/files/1038334/xobupilifafitunejojexo.pdfIn PDF document text
    • http://rimulilav.customerservicetalk.com/uploads/1/3/0/8/130874317/nowuk.pdfIn PDF document text
    • http://files.mymvmtpods.com/uploads/1/3/1/6/131607712/wimukoxuzetokivo.pdfIn PDF document text
    • http://files.perkins-portfolio.com/uploads/1/3/0/7/130738673/xawarutiv_notinet_gogekivatozawuw.pdfIn PDF document text
    • http://zefaki.dealerschoiceaccessories.com/uploads/1/3/1/4/131407802/toxisi.pdfIn PDF document text
    • http://vokisosu.middleforkimw.org/uploads/1/3/1/8/131856435/2d7e0.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/1/0480/1042/8575/files/anti_glare_tv_55_inch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6979/6263/files/kitchen_task_assessment_kta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8648/0028/files/bagatilumodurewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9231/4779/files/35569732754.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1743/9902/files/foot_in_poetry_meter.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_off000079b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B6 5588 bytes
SHA-256: a2fdd899250dded348689f626cc384123feb65ddff378395f3419b3b9a196788
font_01_sfnt_off00008cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB7 9864 bytes
SHA-256: c29bb3fbb65c30fb1534b2f4cfd5b5ffe3a997f32ca748ab3b038d7050d815ad

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