Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc3b0b5346adef0…

MALICIOUS

PDF

45.3 KB Created: 2020-10-27 19:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bbd64f02669c21d23dd477b4359cc9ef SHA-1: d6484a42aeaf49f2980d1537d0622412192a79b8 SHA-256: 6dc3b0b5346adef045e1059c8e7ea8e3e9017d709f2e74b928bd2b60defdcc76
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains multiple embedded links, with one identified as pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The primary IOC is the malicious redirector URL, which is likely the initial step in a phishing or malware delivery chain.

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://ggtraff.ru/strik?keyword=427+side+oiler+aluminum+block In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5f963c26a949f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f89343768ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8c4e87880f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f8f40dfd0331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5f9561204ac3a.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/cdb2d2b47b85971.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/mexefawekasobaleluwa.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/jukonodinabekip_gibupobi_debagogavu_bewozuvawalalu.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/magokexovewuwe-linojogijegajat-dofati.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/roremijobedig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f975e901b1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f92380abb65c.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/8fc416ca-6f3a-4f28-94fc-fe5222203d68/gololadifimebej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395efdb1-9063-4e6c-be57-921b3120af99/beachwood_nj_police_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf09eda-f4bf-4bbb-a304-2f5a4ae75f7c/73882515150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3510f8-113b-4b55-862a-60a28b3523a2/61593041259.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/cognitive_dissonance_festinger_1957.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/10961880744.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_off00007160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7160 5492 bytes
SHA-256: 89af72e6700bd07171a14bd550ea4cb0a1f747a81a94a8566493361c7f8bf785
font_01_sfnt_off000083f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F5 10668 bytes
SHA-256: f498652e1f10f5fb8d86fab336eab94498078d907a7b7cb4308d0e352572307e

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