Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e78a8ce20283219…

MALICIOUS

PDF

43.4 KB Created: 2020-10-07 12:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4044c2c2a73c5231ee901957bdf0f857 SHA-1: 635d13f7a85927acde3086d2fa602d859d7b7405 SHA-256: 0e78a8ce202832194c17364a1e59fbc7571a20739e412b8de4fd24d515ac1985
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs pointing to various domains, many of which appear to be part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ggtraff.ru'. The ML classifier also flagged this PDF with high confidence. The embedded URLs likely serve to distribute malicious content or lead users to phishing sites.

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://ggtraff.ru/strik?keyword=pdf+the+martian In PDF document text
    • https://site-1036775.mozfiles.com/files/1036775/bagabogof.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/kexusosexunususuki.pdfIn PDF document text
    • https://site-1043130.mozfiles.com/files/1043130/puderupo.pdfIn PDF document text
    • http://files.edenmas.com/uploads/1/3/0/7/130776626/vilatidiko-mojutunaseme-zofoke-luzijewe.pdfIn PDF document text
    • http://files.terrimyersmusic.com/uploads/1/3/0/9/130969809/9426471.pdfIn PDF document text
    • http://files.rosemarygallagher.com/uploads/1/3/1/1/131163638/wajamawexipisi-rodelukam-fotuvupero.pdfIn PDF document text
    • http://files.naranjitaflamenco.com/uploads/1/3/1/3/131380870/bezogidopora-rukirataf-juvanixezoluked.pdfIn PDF document text
    • http://files.sophie-chan.com/uploads/1/3/1/3/131379935/8586139.pdfIn PDF document text
    • http://files.gncwomen.org/uploads/1/3/2/8/132814073/2022287.pdfIn PDF document text
    • http://files.boardgameseverybodyshould.com/uploads/1/3/1/4/131437657/2190098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 4616 bytes
SHA-256: 9d25cd0fa8e4f639bad09851147cc3b31f7310abdf29cf9e215bd667c5d950d1
font_01_sfnt_off00007091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7091 10104 bytes
SHA-256: c112e7890728bca973769e53102769493f2dcaa6b57dedcb9654fc62df6cc4f0
font_02_sfnt_off0000931e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x931E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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