Malicious PDF — malware analysis report

Static analysis result for SHA-256 f981e5f084d95c59…

MALICIOUS

PDF

39.8 KB Created: 2020-11-01 09:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 60bf056885b40629ce6555f5a9d74409 SHA-1: 386b02b4012779b98c32ae08c97c152ba9be9adf SHA-256: f981e5f084d95c59b2c204d25bfb02410f58291aa697b5b45f472d3924b27ce3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious 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://ttraff.ru/123?keyword=bernat+baby+blanket+yarn In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5f9265c8d1c69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5f9c7f82cdada.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/zumamomuwap.pdfIn PDF document text
    • https://jafexilodivoso.weebly.com/uploads/1/3/4/4/134499272/gobimuwuxow-wezapetedubov-romozamilaxur-lajuwi.pdfIn PDF document text
    • https://ramojiri.weebly.com/uploads/1/3/4/4/134443871/xisepevel.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/dunageleruguguro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4179/0871/files/kenelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf530b76-85ed-41d0-a9b7-44b90d5e49d6/fenes.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_off00005ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC9 4856 bytes
SHA-256: d0ef01a83deec2a6785ae40b3f0dbbfddd968949269a946d54fe23a9fab47ee5
font_01_sfnt_off00006f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F66 10428 bytes
SHA-256: f4dd1bde8db302ebcbdf8d1e350e3493c4089fbd3a812882f07ffba5307d24c6

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