Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d4613dbfae3419…

MALICIOUS

PDF

43.8 KB Created: 2020-11-02 12:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 571f4531c728d2505c2ca5ab1917645a SHA-1: d4726e4abf9baa1e910f7576d5cee3b8a537ced0 SHA-256: 80d4613dbfae34193af7d0215efa37a2ededd459355522f27ae95fcd3ca1d582
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, including one pointing to `https://cctraff.ru/wb?keyword=jersey%20mike%20s%20menu`, which is identified as a malicious redirector. The document also functions as a link farm, directing users to various external PDFs hosted on disposable domains, suggesting an attempt to distribute malware or phish for credentials. The ML classifier strongly supports the malicious verdict.

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://cctraff.ru/wb?keyword=jersey%20mike%20s%20menu In PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/2345d915c.pdfIn PDF document text
    • https://zowupenejanelaw.weebly.com/uploads/1/3/4/3/134397621/xanatibaz.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/mawojuguwobad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5f9a846e9130c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5f98ab62abac2.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/wijowi_putezijowigaji_jegexusef_vatigodume.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/395567.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/9b00d9d22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5f8e771cb32fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9468/0764/files/the_witcher_livro_2.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/unity_day_2019_cleveland.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4942/2495/files/kevinivudukikiduzufolow.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_off00006e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E97 4744 bytes
SHA-256: 13ff1d07f245b603004122f434a3db86f87af57937d75615b70ebae9afa2647e
font_01_sfnt_off00007ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAD 10696 bytes
SHA-256: caaaf8c371cfe8a160c34eb5746b40bfd275a0686135bfda888d0a87d35a109a

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