Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d980c92e7271b5…

MALICIOUS

PDF

43.5 KB Created: 2020-11-08 01:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 51ef60408684929567861b7991a6e031 SHA-1: e6facee22c1f1d2e00843da887e35dc888c20a1e SHA-256: 71d980c92e7271b5ce91c8a38bc93203c9f8f18c6681535242d5a2b08b58a6ab
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's structure suggests it is designed as a link farm, potentially for SEO manipulation or to distribute malicious content via the numerous URLs. No scripts were extracted, but the presence of malicious links is sufficient evidence of harmful intent.

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://ggtraff.ru/123?keyword=norm+macdonald+book+club In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f89d310eb94c.pdfIn PDF document text
    • https://negoladudovas.weebly.com/uploads/1/3/4/4/134456372/luperomebaf-mamiwenozoxulil-derawabu.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/717438.pdfIn PDF document text
    • https://vajibudutoneraz.weebly.com/uploads/1/3/4/3/134345344/melotozozomemap_porobowewunowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f8b4b28d44cd.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/78f4c1a549b16.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/wuferotuliguxag.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/wilugugo/genetic_disorders_diseases.pdfIn PDF document text
    • https://serosekufe.files.wordpress.com/2020/11/mixojiviturojomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6d2990-0c70-4a71-bc44-4e6ac5cdf9a3/how_long_roasted_chicken_in_fridge.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/vinik.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_off00006a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3F 5080 bytes
SHA-256: 597adf8e0228d0a4b8f573f2a55bd8393dc97ad38bb9fc12eb84095d66bda203
font_01_sfnt_off00007b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B73 11308 bytes
SHA-256: 1ea02e5c6225124fbb0fb57c2b7f87e3e81bb7b46a17a0dbffa9a70c16f180d2

Open this report in the interactive analyzer, or submit your own file for analysis.