Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3488e458e973d19…

MALICIOUS

PDF

39.4 KB Created: 2020-11-04 07:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 31627acc734d9d75e8fb894faa04d945 SHA-1: 9c59cfb27961225dbe1f452a42f6cec92cb19da5 SHA-256: a3488e458e973d1985372ba9ef5b533282a9fb7683db6e1e18c231711f3d846d
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/strik?keyword=eso+drain+health+poison+ix+ingredients In PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/54f14fe16e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_5f9abeace4a32.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/movonim_tamemilugisab_pizizegux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5f9d0be61b600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_5f9fc179a00bc.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/sobaxorubugozakifom.pdfIn PDF document text
    • https://lifagixuwemup.weebly.com/uploads/1/3/0/9/130969738/8133835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403417/normal_5f94d97712d99.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/9638183.pdfIn PDF document text
    • https://vajibudutoneraz.weebly.com/uploads/1/3/4/3/134345344/sopagusip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5fa00df733377.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/nibafedujizin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5fa08dccb0749.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/f96b2bfc-e6d1-4e33-aff6-44ff236c4ffb/carolina_salgado_broche_fotos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35be705e-c0d1-4237-91ee-19295330b055/bmw_3_series_wiki_f30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe95ea4-e36a-438d-bd10-33d28ece11af/48586663544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a99eb6-d409-48ae-8a94-0d774b6c5fa1/hellcat_redeye_specs.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_off00005b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B45 5244 bytes
SHA-256: 8fb411b36ac26d355a2a3fb4baca4642b883e61e595be060bfb4de322b24a593
font_01_sfnt_off00006d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1A 10212 bytes
SHA-256: 485953f0176f1965d594707171dfad5bdbadb91ed27e888a64baabf74c6ea4f6

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