Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe2c6bc164906c9…

MALICIOUS

PDF

41.4 KB Created: 2020-10-06 10:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a594d7857cff4bfaf082cf6b714997d SHA-1: d8dc83f7a42ca0db9b4ee008df4ca7546943ed70 SHA-256: bbe2c6bc164906c92808d00760778fd79838e8f78c9f0bea197edb77ecce0f69
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?keyword=sociology+of+law+pdf+noun'. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of numerous links suggests a link farm or SEO manipulation scheme, potentially leading to malicious content.

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://ggtraff.ru/strik?keyword=sociology+of+law+pdf+noun In PDF document text
    • http://moxakezub.westsideindustrialpark.com/uploads/1/3/0/7/130739240/816846.pdfIn PDF document text
    • http://files.abetterdayhomecareservicesinc.com/uploads/1/3/0/7/130775127/waxojobabof.pdfIn PDF document text
    • http://files.hodgmanliterary.com/uploads/1/3/1/4/131453432/bagimisugewaj.pdfIn PDF document text
    • http://files.ellennorrish.com/uploads/1/3/1/4/131483112/8337203.pdfIn PDF document text
    • http://rujiguxi.thecountup.com/uploads/1/3/2/3/132303374/tudura_roxixo.pdfIn PDF document text
    • http://ketator.heritagefloristcortland.com/uploads/1/3/1/4/131453558/6172085.pdfIn PDF document text
    • http://files.happyhometherapy.com/uploads/1/3/0/8/130814611/07939b9.pdfIn PDF document text
    • http://files.lgbtamish.com/uploads/1/3/1/4/131453329/3960544.pdfIn PDF document text
    • http://doxipip.youthgolfersoutreachprogram.org/uploads/1/3/0/8/130813765/zeretekul.pdfIn PDF document text
    • http://nugusej.splfairmont.org/uploads/1/3/1/3/131383664/1412359.pdfIn PDF document text
    • http://files.sammyreid.com/uploads/1/3/1/4/131454770/salukile_tosakarut.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/3f2a1ca2-3428-462b-a1e2-88d5a132ecae/lewuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c14f61e-4ebd-45ce-8a22-7a7ea1124ece/29372522106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f71995-2f5a-490c-b453-04101d4dce64/kinolutixusevosadaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1d6186-5ef5-4203-8296-49f530dccd9d/narepabijepig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28241c8-fb4b-4869-ba6e-567fe43764bd/26191993775.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_off00006185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6185 5344 bytes
SHA-256: 150d646eed89da74a6ff03ddad6a9cc306194fe8ab2082f8604fb8f12eb14201
font_01_sfnt_off000073e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E9 10436 bytes
SHA-256: cd5e414923d0d4ad6169db3963968814054765ac021c85c497439ff61500ab4d

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