Malicious PDF — malware analysis report

Static analysis result for SHA-256 db69236c48cc60f8…

MALICIOUS

PDF

41.4 KB Created: 2020-10-14 19:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 886f098e7a3cf3ba2f62f32742530c16 SHA-1: b8a161f5dce9ac791b1af5f7ef784f16680fa411 SHA-256: db69236c48cc60f8b74eb172796f36cf69338963fbb75fc4d7b4cfa1e1df95e3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to external PDF documents, indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially harmful content or for SEO manipulation.

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/123?keyword=our+guide+tv+hobart+tonight In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f8722c0d1c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f86f7776f3cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f86f40fc961c.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/a7b88.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/2efecb114f5e5.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/pegefidokoxim_wobofebiwepulaw.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/9144969.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/7061675.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/53b120cf7ca63ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b080a31f-da10-47ba-a046-50c279da9d70/medetuxoxuxivofemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d632571-6499-4919-b73f-cd753d427914/gixazazuluj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31e5eda-6a2b-4d77-aaee-023f437edab3/gazozuzugowunejozevipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f16ee2-d3ec-49a8-b13b-27f17535b5ff/tadom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3fefe9-529e-4597-9181-10719523e681/34231287063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a493e32-2b41-486c-9ef0-a95ce9f15e38/vezidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7804bd03-d85c-429e-b574-fbb598e7b7f2/xopepupazowasimavav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab03389-7be2-4523-aae6-a0e58c94eac0/73498093827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fbcc3c-eb8b-4451-84e8-a40d56328d24/69110511195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede02e39-d14a-4343-be7b-3af487ce911f/ritevugobosaruvujexovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7bd300-1b3b-459a-932c-165c360e2308/femafod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce05847f-0810-485b-b260-e04a5bf41e8e/dazulapuv.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_off0000647d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647D 5104 bytes
SHA-256: 71e391b346b33a4ebd6405d33b6cb0cd4cc578ac32ca61d2bd1dae6e41f9df8e
font_01_sfnt_off000075d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D6 10012 bytes
SHA-256: 8ddc1316c514e6134099f6200b9c651658d74c3996c1dffa15b2314e6aab099f

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