Malicious PDF — malware analysis report

Static analysis result for SHA-256 632eaad338919de8…

MALICIOUS

PDF

38.2 KB Created: 2020-10-07 12:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6a2b134c16782844d86dafb35867e668 SHA-1: 9719d023cd34277bd78e04ff46c1eb562ea6f65f SHA-256: 632eaad338919de8d92953cfef17fc047bb5101894cb9fa312fcaa1f669cc21c
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the file is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=mesurer+des+segments+ce1+exercices In PDF document text
    • http://fakuzu.radio91.net/uploads/1/3/1/4/131453495/5545939.pdfIn PDF document text
    • http://files.pilateshaus.com/uploads/1/3/2/6/132682640/zuvubusafaz-dukose-pabalis.pdfIn PDF document text
    • http://files.fallsvision.com/uploads/1/3/0/7/130739704/butisiguz_koromubedifivub.pdfIn PDF document text
    • https://site-1048452.mozfiles.com/files/1048452/91970073483.pdfIn PDF document text
    • https://site-1038552.mozfiles.com/files/1038552/wijalorozotuwusu.pdfIn PDF document text
    • https://site-1042514.mozfiles.com/files/1042514/31388553185.pdfIn PDF document text
    • https://site-1043091.mozfiles.com/files/1043091/27043175581.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/10675929302.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/1/0440/7469/6856/files/40737332564.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/domain_and_range_quadratic_function_worksheet.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_off000054a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54A5 5144 bytes
SHA-256: b12794e6a1185687fab3af95fec1ff9cdcfef5b9ce35de7137d89b76088a85b1
font_01_sfnt_off00006626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6626 11312 bytes
SHA-256: 84348d10d1ee8d0330dfcd3814963d19c7014997534c0ff87a1e9dc7f57db439

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