Malicious PDF — malware analysis report

Static analysis result for SHA-256 1487f74451fcc399…

MALICIOUS

PDF

40.6 KB Created: 2020-10-12 00:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 92c9aafee0797e535e452e0392f141ab SHA-1: 755a0a28b6f0e27482d72726a0438b4772e19936 SHA-256: 1487f74451fcc399f0c131ccf64138e86cdcac707613ed6900dd4a064a9be894
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirector infrastructure. The primary URL, 'https://cctraff.ru/strik?keyword=machinery+failure+analysis+and+troubleshooting+pdf', is flagged as a malicious redirector. This suggests the document's purpose is to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

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=machinery+failure+analysis+and+troubleshooting+pdf In PDF document text
    • http://lines.carriebaxter.com/uploads/1/3/2/6/132696021/f7a3633e1.pdfIn PDF document text
    • http://files.sailingsteadfast.com/uploads/1/3/1/4/131452750/1a758c37c0d87.pdfIn PDF document text
    • http://wusuvojo.cotherstonedeerhounds.com/uploads/1/3/0/9/130969191/8c00226.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/mubivorapuzu.pdfIn PDF document text
    • https://site-1039807.mozfiles.com/files/1039807/18599820359.pdfIn PDF document text
    • https://site-1038470.mozfiles.com/files/1038470/nipavum.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/boregev.pdfIn PDF document text
    • https://site-1043475.mozfiles.com/files/1043475/48352597909.pdfIn PDF document text
    • http://maguw.mysticmancreations.com/uploads/1/3/2/6/132680981/pipupidinamolaw.pdfIn PDF document text
    • http://files.sowellscience.com/uploads/1/3/1/4/131406629/febevepara_dusaleluregarem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8aa6be2-9c8b-4cfb-b359-a99285617d2a/26794791305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3cdbe3-00ce-47eb-9b04-70824ba043dc/kufesilexanejizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a73452e-5b62-45df-b1f4-bfcbe17c2dd7/24020490733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fd44f3-24a2-4e60-9a77-d343daff614a/81709655876.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_off000060cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CF 5664 bytes
SHA-256: 6d7cd7a5a4fb6ae003c8df803ddbd3d86af570a4ca3b4e238c0e67cbff0067c7
font_01_sfnt_off0000740e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x740E 9820 bytes
SHA-256: 3470839be0b2f99075c5c4632878700e4f7d5638f5440222907626fc73bff407

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