Malicious PDF — malware analysis report

Static analysis result for SHA-256 84db9e7c89dcfea6…

MALICIOUS

PDF

32.4 KB Created: 2020-11-09 15:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 07e57afa3f4f22361255cb3950479c63 SHA-1: bff715909ae81b24863ddc6d7b56f36e41d96971 SHA-256: 84db9e7c89dcfea60e2872e4d47fada8061d12209cdf05ab3bbffab54e736a77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external PDF files, indicating a link farm strategy. One of the primary links, 'https://ggtraff.ru/aws?keyword=blood+drip+png', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The sample's purpose appears to be to redirect users to potentially harmful content or to manipulate search engine results.

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 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.
  • 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/aws?keyword=blood+drip+png In PDF document text
    • https://zasesitezo.weebly.com/uploads/1/3/3/9/133986829/vumevo-gutemov-mopasobavelezo-zifarexedubudoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f8b63fb79db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f9e2351ce8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f9adbbe91155.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/jixuxogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_5fa5821d6ea42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f88791dc7c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_5f983e1800d4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f8a1dd0ba48f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5fa62d3966efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5fa89bcb62cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f96080fc2f17.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_off0000452b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x452B 4788 bytes
SHA-256: 44e5825b753f1ed9d1d85e777cfb12f98b44e855741a114847580ddc39fe6cb4
font_01_sfnt_off00005584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5584 9284 bytes
SHA-256: 192192e4368f7e7c8906670aa912409096928af8ae78e351bea03d222e0e9f6e

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