Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ae92e64a0824d…

MALICIOUS

PDF

39.9 KB Created: 2020-11-07 00:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 895004302ed9d9a33f1f3fa03886a649 SHA-1: 5d2c439b7eecf4059473071f2022049cc6e926ba SHA-256: b66ae92e64a0824d448d0f8ecba4a10637fdfe050c3642f6063ada945de9b69e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier as malicious and contains numerous embedded links. Several of these links point to known malicious redirectors or are part of a link farm hosted on disposable infrastructure, indicating a likely attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes. The presence of a malicious redirector URL suggests a high likelihood of user redirection to harmful 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://traffmen.ru/123?keyword=new+lenox+parks In PDF document text
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/mosezifareromad.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/kijidojezef-vamubisuriveb.pdfIn PDF document text
    • https://xunowarusaki.weebly.com/uploads/1/3/4/3/134371630/paxidef_zekezekezozowir.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/vojibiwemaza.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/nunobavupig.pdfIn PDF document text
    • https://ravidaxixow.weebly.com/uploads/1/3/4/3/134315840/52feb0d0232dfa0.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/lobuf_zuveditewomu_womalejimebe.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/1373242.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/debizikirapanas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://subijiputeda.files.wordpress.com/2020/11/anestesia_local_odontologia.pdfIn PDF document text
    • https://legowuvirifa.files.wordpress.com/2020/11/pokuweje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e00042-b13b-4a67-955b-63ae94bf4fc8/31467861845.pdfIn PDF document text
    • https://palotev.files.wordpress.com/2020/11/moder.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_off00005fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 5008 bytes
SHA-256: 2f869ad0ff5dc124b8f2b8e7fa13250a0586666dd23552f1d0216de8ee02e86d
font_01_sfnt_off00007109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7109 10024 bytes
SHA-256: 6575b8bcec362638a3e714d03028acc9fe9ae3a1110b3b60c8fa1d163134c58d

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