Malicious PDF — malware analysis report

Static analysis result for SHA-256 60323a4daf76a847…

MALICIOUS

PDF

33.8 KB Created: 2020-10-01 19:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e34e531a1f263c1092c57ead5826fb59 SHA-1: 798ac87e2a070c1cc0afdc2be9f66c79071d00ba SHA-256: 60323a4daf76a847f06daae73eaf405d36cce2e15ee7b75fa139a341e077a8ac
124 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, disguised with keywords related to software downloads. The ML classifier strongly indicates maliciousness, and the document body, though obfuscated, contains URLs pointing to potentially harmful content. The primary attack vector appears to be a lure for users seeking software, leading them to malicious infrastructure.

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 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=acrobat+pdf+reader+for+windows+xp+free+download In PDF document text
    • http://sejanar.wakefieldmiddleschoolpta.org/uploads/1/3/2/6/132682006/wigolina_muxizemakebi_vuwima.pdfIn PDF document text
    • http://files.urbanity.ca/uploads/1/3/1/3/131398129/tenutugagevipalu.pdfIn PDF document text
    • https://site-1039952.mozfiles.com/files/1039952/ludow.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/85895536864.pdfIn PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/46947844187.pdfIn PDF document text
    • https://site-1038552.mozfiles.com/files/1038552/fomigudizubudavibunapen.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/1554fbb7-e2ae-4b86-a751-bf577fb16f36/25064740371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55981d0b-fa08-499b-9c6e-4670c69b5285/69533585985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0717546c-e0a5-4450-aada-96213248fe7d/solubonufopazitijod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3625/8716/files/13895079682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8829/7630/files/20211225339.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_off00004615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4615 5436 bytes
SHA-256: 586b8da20c4d69cfb82654a064f1f2c94cdfaaa15ec7dc330148db4bcf3fca91
font_01_sfnt_off000058b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58B2 9848 bytes
SHA-256: ba50503913c918a8f617b2118c444d16d0753bbfc3834647185b7e521def37e3

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