Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5efc1666a7a96a…

MALICIOUS

PDF

37.9 KB Created: 2020-10-11 09:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fbdbc0a36117976f89c04918daf070e8 SHA-1: e1eb38b1c7bcd15c4bd1c680c17a35ba0c15a27b SHA-256: 8a5efc1666a7a96a536d9280961a8272f4bfe3c46e2e3d21ba0c72e494dafbb2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple embedded links that point to disposable hosting domains and a known malicious redirector. The primary link, https://cctraff.ru/strik?keyword=you+won+t+relent+tabs, is flagged as a malicious redirector, indicating a strong likelihood of malicious intent. The document's structure and numerous links suggest it functions as a link farm designed to funnel users towards harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/strik?keyword=you+won+t+relent+tabs In PDF document text
    • http://files.kamagongchemtradecorp.com/uploads/1/3/2/8/132814980/niduwafivurav_donudigijofa.pdfIn PDF document text
    • http://javeseva.en.yvesalizahno.com/uploads/1/3/1/6/131607163/4031112.pdfIn PDF document text
    • http://wonesu.josiahhunt.com/uploads/1/3/1/6/131606113/1b93d77e31.pdfIn PDF document text
    • http://files.behappypiecompany.com/uploads/1/3/1/3/131379041/b4d12.pdfIn PDF document text
    • https://site-1038909.mozfiles.com/files/1038909/vixetivu.pdfIn PDF document text
    • https://site-1038770.mozfiles.com/files/1038770/63340213093.pdfIn PDF document text
    • https://site-1039197.mozfiles.com/files/1039197/7809388675.pdfIn PDF document text
    • https://site-1041613.mozfiles.com/files/1041613/sexisak.pdfIn PDF document text
    • http://files.csi2spy.com/uploads/1/3/0/7/130739624/6629529.pdfIn PDF document text
    • http://files.mykitchenkitchen.com/uploads/1/3/2/7/132740978/5044082.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41C3 4872 bytes
SHA-256: 5279e35119e43c0b8b74b60088c18b94d990c555c760bbf095e747e9a23915d6
font_01_sfnt_off00005273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5273 10212 bytes
SHA-256: d18e0b92d9ccc6ba67575728d9af3f6a6b1a11143ad31458f65ca5db60b2d598
font_02_sfnt_off0000758f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758F 16204 bytes
SHA-256: 514ec34c774379c82780ce3b826aceada3291152a2a4734d997485cf707bbc49

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