Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5287b14083821a…

MALICIOUS

PDF

41.8 KB Created: 2020-11-07 13:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2d54f9404d887addf97dccca92b513b5 SHA-1: 5c492c32ea1233894f180df1f3f26e7118abb59e SHA-256: 4a5287b14083821a283f4daabef4a37aad12556fae60fb0463b8130370278541
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=english+banana+games+boxhead In PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/7905fb6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_5fa29f0af2ec9.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/0d82088.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/9022456.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/zogudasuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fa2628e41c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f96d32b8371c.pdfIn PDF document text
    • https://xenapake.weebly.com/uploads/1/3/4/3/134353424/jizixopozolod.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/cf270be.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/nubigikuwuzox.pdfIn PDF document text
    • https://fevijalefo.weebly.com/uploads/1/3/4/3/134383315/gabegepupenasup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411708/normal_5f9c50f9dc3c4.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/c0c90240-77d5-4c51-8876-4f2bd0b765e7/1088092184.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BD 5308 bytes
SHA-256: f8e0645044b9ba413d386f886ffe39535c83a4384d418212a748d105868afb08
font_01_sfnt_off000074ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74AB 11136 bytes
SHA-256: dceb07e25b6f5675c5deb3644c5d31944198267a31acddf6fd6f000a4c96da02

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