Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fbc4495ce3efc7…

MALICIOUS

PDF

40.0 KB Created: 2020-11-01 10:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c1c021be7b2affca0c907dd3c7c36ff2 SHA-1: 1c8fb8ab487f6763af1c048609cdee49b7a13465 SHA-256: 41fbc4495ce3efc77ca0f3aaa3ff52eed4d920bfc784185e1ec56192183cf58e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable hosting services and a known malicious redirector. The document body, though partially corrupted, includes a URL that appears to be a lure for search engine traffic. This suggests the PDF is part of a link farm designed to redirect users to malicious sites.

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/123?keyword=oscar+nominees+for+best+picture+2020 In PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/zomowexem.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/kozasoj-gapuro-zuwidaru.pdfIn PDF document text
    • https://nozudasukexip.weebly.com/uploads/1/3/4/4/134441991/9583811.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/6859348.pdfIn PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/dd808.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/sotukijodove-nomotenadirerin.pdfIn PDF document text
    • https://sofasiwo.weebly.com/uploads/1/3/4/3/134319993/6b4e58f8b6e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/samsung_46_inch_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7e9aa3-fb6b-4a32-a98b-4427f0857fd1/jemowugav.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/jodejebixovefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0270/2242/files/why_dont_schools_do_anything_about_bullying.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_off00005c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7D 5572 bytes
SHA-256: c86954f10d235f110da10d684d974bfaf1854c77a384ce4a38d35d0072b1a783
font_01_sfnt_off00006f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F52 10680 bytes
SHA-256: 3fb5bf15d3eb0e0ada64d33bf8e129fa1c0a4696a031724e1d4ed34eb6461011

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