Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0c9215ede8d241…

MALICIOUS

PDF

42.0 KB Created: 2020-10-31 12:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c10f7814172cfdfcd2f3280d5113aa06 SHA-1: 19ee759a38580e16d176a820957338f003bf4023 SHA-256: bb0c9215ede8d241ef04006ed891dc615d132ce84c5f9484432020b1aa1b1be3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://ttraff.com/123?keyword=examples+of+ethnocentrism+and+cultural+relativism, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/123?keyword=examples+of+ethnocentrism+and+cultural+relativism In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f947888ce1bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8d59e3be292.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/5562877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f9016cf83b98.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/d2450598-4040-4bb3-b0f6-631d03164af0/xoruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358c9b13-39c5-4f65-9a84-dd94f98450ef/vugiwetadisenezozebegef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31365da2-ed1f-48aa-a16e-274788018839/difaselawidotobexeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084f5d18-7b41-4518-a4cd-b64b84a3858d/zunejifabasotetenetusi.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/pimige.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/proportional_tables_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9980fad4-4e82-48a1-8729-5caa33a6238b/topology_munkres_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0426c2bd-bf00-42f2-91f7-73bc22d28043/lufobegiroguramibatuvupo.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/belajar_macro_excel_2007.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_off000066e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E5 5480 bytes
SHA-256: 6088b77abeba5e475bcbc383ab413d9d97b0b60a7abca5b421be6db596d15fd1
font_01_sfnt_off00007966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7966 9856 bytes
SHA-256: 2e768be1b656fd08b416d9d20bbd23999f6ff2ee294865d2f58bebe960bc9a90

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