Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd5c1e5f783e40b…

MALICIOUS

PDF

32.5 KB Created: 2020-10-28 21:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7348dfb8113722ba174693ddb80ec50c SHA-1: d964600ea2739e7ac03c55c6f6e340b8f5ea34ca SHA-256: 4bd5c1e5f783e40b8864950bc1d3cc2764954f07ec53da8119365126a54f9027
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirector services. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to `ggtraff.ru` as a known malicious redirector. This indicates the document's primary purpose is to redirect users to potentially harmful content, likely for phishing or to serve further malware.

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=somerset+regional+animal+shelter+petfinder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f896cab38c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f92af0c2e4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5f89d00267d9d.pdfIn PDF document text
    • https://fomomeku.weebly.com/uploads/1/3/2/7/132712435/a963dcfe8e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_5f970c8e51c47.pdfIn PDF document text
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/812841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f8a7a8f54142.pdfIn PDF document text
    • https://tagarimoruta.weebly.com/uploads/1/3/4/3/134320697/wiwazef_poxejuvavit_wiziru_takiso.pdfIn PDF document text
    • https://tumovapexawezan.weebly.com/uploads/1/3/1/3/131398362/5445154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5f98fb2f8034e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5f996c813f8dc.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/kozibamenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f8bd0434a066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f95abc7db752.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/wonoti/pijuririfajuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1411/7293/files/coffee_grinder_manual_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/i_dreamed_a_dream_easy_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8904/1837/files/siddhi_vinayaka_stotram.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_off000043c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43C8 5560 bytes
SHA-256: 3745b1290feac8922db4ee4a3d236f5f96e7fd6e5eccfc02d4e5158f722846a7
font_01_sfnt_off00005679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5679 8864 bytes
SHA-256: 5872f11b77bb0d437e6f8fb2907cd425eabcc56a2314883968b5e41168f9a7be

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