Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c19ceb0e67fb8aa…

MALICIOUS

PDF

41.9 KB Created: 2020-10-29 14:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d67e554d9583d43692b6a51e143178e0 SHA-1: 551b59ca30ae5aed6d647a52aad13f84ee595639 SHA-256: 5c19ceb0e67fb8aae484b789bcb018e1ae6f04e79368a41247af9bfcebfc5d20
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains a large number of embedded links, many of which point to external PDF files hosted on disposable or suspicious domains. The primary heuristic firings indicate this is a malicious redirector and a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/wb?keyword=uncooled%20thermal%20imaging%20arrays%20systems%20and%20applications%20pdf In PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/3949771.pdfIn PDF document text
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/motiduliv.pdfIn PDF document text
    • https://lebidupevi.weebly.com/uploads/1/3/4/3/134319251/43aea4ecf975b4.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/93049f265a0000.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/8645161.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/980b753a-c0e3-4a77-ac7b-aaa5a3cd463d/zosovomepikivigokuwupe.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/cardiopatia_isquemica_unam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3954/2424/files/93697686751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7efa6a-7c6e-4ffb-92c2-58a029201430/wefazogumapedepinajuwage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7846/0596/files/22197704707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b54f61-4b6c-4ef0-aff8-892c171f9be5/80486827658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03c726a-cdba-4da1-81c2-fe1ba55fadf1/10._snf_kimya_soru_bankas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bef24f0-a462-4cad-9a13-e075a3a46617/nujopawoxewenudexifedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/fallout_4_the_castle_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234bd569-5d25-413d-94e4-6a58f5103c10/0_bl_0_belirsizlii.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_off00006225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 5664 bytes
SHA-256: c8198739beb4e53ca5e2c78fd5aa60c09ecf0703794cbf2cf83342400b5b9aa6
font_01_sfnt_off0000754b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x754B 11448 bytes
SHA-256: 4d8d16112d66bb86dc1d1bb5add8f2b287d6bf0c1a7e8187d7095b8db6e85a40

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