Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cdd96b2e841355…

MALICIOUS

PDF

39.4 KB Created: 2020-11-05 05:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b63c9e117f2f21e61096e05454125810 SHA-1: df8730c9dedf905bffc90f88f6b53b84740699ca SHA-256: 25cdd96b2e8413551c2107adc773b7b962308cf234f6cd9f47120c81c1211785
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/strik?keyword=occ+safety+and+health'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body indicates an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=occ+safety+and+health In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_5f9900435bfd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_5fa1c8d7b050f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_5fa0459ada230.pdfIn PDF document text
    • https://rebivawofud.weebly.com/uploads/1/3/4/3/134375894/nifofa-sataseg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_5fa1b250b71f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/serena_williams_husband_and_child.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/dedununupaful.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/wuporox.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/demised_premises_meaning_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/ib_tok_guide.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_off00005c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0D 5144 bytes
SHA-256: 91ecadf9f35d5ed55552a24caea9c1b11f85e6c18d541e9e25d2470d62fc0891
font_01_sfnt_off00006d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D98 10552 bytes
SHA-256: 7f4bb044adfecfbca1d54f8d4d3d8e279bfd7c51e4b465a7203a6ec580c24d84

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