Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1de521ac96a5cf…

MALICIOUS

PDF

42.5 KB Created: 2020-09-30 18:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8cf37d21e9b88d7f59bc2fcffcf542db SHA-1: 3170163812945431d9233c28ef9a15733e31f53d SHA-256: 3a1de521ac96a5cfc029e6d690226428bde253a69236ae5b711269ee6e8164b6
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to these redirector URLs, suggesting the primary purpose is to lure users to malicious sites, likely for phishing or further malware delivery.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=numeric+and+geometric+patterns+grade+7+pdf In PDF document text
    • https://site-1038505.mozfiles.com/files/1038505/gagefafobunilifo.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/jikanezuvesemifofopazi.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/kedoborebakixipava.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/mewevobemipa.pdfIn PDF document text
    • http://ranidazok.legendsdolive.com/uploads/1/3/1/0/131070458/gasuju-dagiketeli-konopijevi-moduzusexikof.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/nosozuvutifevexaxofukax.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/nufedebebununovumiloja.pdfIn PDF document text
    • https://site-1038595.mozfiles.com/files/1038595/81342267629.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/50307961908.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/betufuvupidakefozove.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_off00006815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6815 5492 bytes
SHA-256: 5d43270bfcd18bcba496ab25ae76d41f355dcd194e439498470077312b18806c
font_01_sfnt_off00007abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABB 10188 bytes
SHA-256: 1183927128c056f9cf402c7fac970dd0e14206491e90a86669fa58b24270ac19

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