Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1bbdf1fff71dae…

MALICIOUS

PDF

39.7 KB Created: 2020-11-04 20:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6e11d5ceb5f8d5ff2d0a63226c3ff40e SHA-1: b7b55cfb5ee79edb68f4e1d1b2007430f2345bd8 SHA-256: 7e1bbdf1fff71daecd84ce03a059247100a11858f5613389cf85d1a840ce06f6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links pointing to various PDF files hosted on disposable domains, indicative of a link farm. One of the primary links, 'https://cctraff.ru/123?keyword=castsequence+macro+wow+classic', is flagged as malicious redirector infrastructure. This suggests the document is designed to drive traffic to malicious sites, potentially for SEO poisoning or to deliver further malware.

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/123?keyword=castsequence+macro+wow+classic In PDF document text
    • https://lugagixoweliw.weebly.com/uploads/1/3/4/2/134234548/8c58929b4.pdfIn PDF document text
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/rozonute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5f9c4b3c626b6.pdfIn PDF document text
    • https://kizilezena.weebly.com/uploads/1/3/4/3/134354573/7ceeb3ba825b02a.pdfIn PDF document text
    • https://kajibelewori.weebly.com/uploads/1/3/4/3/134307873/mozifaduna.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/5258882.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • https://kenumobubedu.weebly.com/uploads/1/3/4/3/134370592/e8d34.pdfIn PDF document text
    • https://petarukezatu.weebly.com/uploads/1/3/3/9/133997491/8531841.pdfIn PDF document text
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/7a5104b52098f38.pdfIn PDF document text
    • https://jijutuvexezepor.weebly.com/uploads/1/3/4/4/134444828/xomozevajoxelajilime.pdfIn PDF document text
    • https://jepirozo.weebly.com/uploads/1/3/4/4/134474462/68f4634e7cf2ae.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/9851903.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C80 5068 bytes
SHA-256: 2df1cd1b7354be3f2dc186cf95072091c957dc0b4fa228a271b39fcae8c1d650
font_01_sfnt_off00006db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB6 10660 bytes
SHA-256: 4d17eafed0a2faf68815c29e620994b1aa49d705d67020c96e2223eb0ab9796e

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