Malicious PDF — malware analysis report

Static analysis result for SHA-256 13aaf3e7e1d0700c…

MALICIOUS

PDF

38.5 KB Created: 2020-10-02 05:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8ec42dc970c50423a4527f709926579e SHA-1: 930bf655e63912990de99c1cc819aac55271d9b3 SHA-256: 13aaf3e7e1d0700c30c871be59f49c99e78248be9b7a7181e9822ab70b65bb1e
184 Risk Score

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/strik?keyword=bjp4+self-check+4.1%253A+logicaltests In PDF document text
    • http://kasajat.santafedatahub.org/uploads/1/3/0/7/130739393/2884976.pdfIn PDF document text
    • http://files.balancingmedicine.com/uploads/1/3/0/8/130814401/xugamesexot.pdfIn PDF document text
    • http://waditazid.aahsanguilla.com/uploads/1/3/1/6/131636601/9868729.pdfIn PDF document text
    • http://parewala.transactionbankingacademy.com/uploads/1/3/0/7/130738837/5215799.pdfIn PDF document text
    • http://files.mauriceparent.com/uploads/1/3/0/7/130738614/64e172e7e.pdfIn PDF document text
    • http://files.therapeutichealingandwellness.com/uploads/1/3/1/3/131379671/2172354.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/588e6735-4484-4575-861b-4334c9f7e896/kilugomiker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873e16c7-10dd-4997-b9c1-1cd12d4774f3/95177198269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9942e52-0300-4126-9c1d-6539224d087d/sosiwojojarapomexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99dd2618-39d9-458b-bd76-573bca578aa8/42545719659.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4019/7784/files/58789159260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9521/8594/files/star_wars_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2976/0670/files/dd_polearm_master_spear.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/wogozexovatu.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_off00005534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5534 5624 bytes
SHA-256: d4c471e8e927d9ff1a8ebda780c2cbbbee045654ad8515541d6eb3e25b793041
font_01_sfnt_off0000688a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x688A 11200 bytes
SHA-256: 4b63b185e783478b8bceec82d6657aa2f296a888429dc85f2c52ce3900e07167

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