Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0ca398d88314b4…

MALICIOUS

PDF

32.7 KB Created: 2020-10-10 16:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7480d5d50f5414a61bf58c580e8edec3 SHA-1: 61d06bb0eecb8076b1e10e947c0e12313ce71b78 SHA-256: db0ca398d88314b4c01e6d54d0df82d7f64941d072919ebc2ae4d633083c8a1f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though partially corrupted, includes the URL 'https://ggtraff.ru/strik?keyword=caso+practico+de+contabilidad+agropecuaria', suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=caso+practico+de+contabilidad+agropecuaria In PDF document text
    • https://site-1037870.mozfiles.com/files/1037870/wopakabisoluxetos.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/sabozisomanamizepo.pdfIn PDF document text
    • https://site-1039563.mozfiles.com/files/1039563/filiruwep.pdfIn PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/94242332463.pdfIn PDF document text
    • http://porajaju.nhstudentwellness.org/uploads/1/3/2/3/132303064/b8cc27.pdfIn PDF document text
    • http://files.taliabeck.com/uploads/1/3/1/3/131380467/3618359.pdfIn PDF document text
    • http://niliweg.zopyratheatre.com/uploads/1/3/1/8/131860553/3925881.pdfIn PDF document text
    • http://ratiwu.seanbuckart.com/uploads/1/3/1/3/131384081/7604435.pdfIn PDF document text
    • https://site-1036697.mozfiles.com/files/1036697/68756019873.pdfIn PDF document text
    • https://site-1038857.mozfiles.com/files/1038857/21610428944.pdfIn PDF document text
    • https://site-1039198.mozfiles.com/files/1039198/72865747446.pdfIn PDF document text
    • https://site-1043287.mozfiles.com/files/1043287/14732286084.pdfIn PDF document text
    • https://site-1038412.mozfiles.com/files/1038412/36908026088.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_off000040a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40A6 5288 bytes
SHA-256: 68b3ccef6b15b98325bd94b15e99acc0f379493fd3c41da9de8069357eaccc06
font_01_sfnt_off000052a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52A7 10184 bytes
SHA-256: 982e3cb3972c073b56cbc81bc7d734939aa57a51946975aac2fb45b317c76b13

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