Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72e8aca36452d0a…

MALICIOUS

PDF

40.1 KB Created: 2020-11-05 22:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8eed48f3f482aac8d2dd34072032a947 SHA-1: 91ca062c6da17444d54f822b06d49ed01294b1ce SHA-256: b72e8aca36452d0a515f04475a769ed111ce5804bb51284d3d03f27a761fb459
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary malicious URL is https://cctraff.ru/aws?keyword=aganglionic+segment+in+colon, which likely leads to further malicious content or phishing pages. The document body, though heavily obfuscated, also contains this URL and other links pointing to Weebly and AWS, suggesting a coordinated effort to distribute malicious content.

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://cctraff.ru/aws?keyword=aganglionic+segment+in+colon In PDF document text
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/xikebisesisusujamexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5f952faf50b9f.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/bdb0b14.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/6870353.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/5470614.pdfIn PDF document text
    • https://sogovowezop.weebly.com/uploads/1/3/4/3/134324678/lanozutovamofesasof.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/palikuvexake/prayers_for_bobby_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/kevurafuzig.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/8932176051.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/ciencias_naturales_5_primaria.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/bafime.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/chemistry_lab_report_example_density.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cff27a-e31a-442a-b049-8a4dd7740f88/46344203911.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_off00005f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F43 5012 bytes
SHA-256: 27a5d669004c4995bb9e79bf3d579bec28de5882c0610e50ef6968695d285c0e
font_01_sfnt_off00007043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7043 10396 bytes
SHA-256: d7999adbfcff3556982a721ad8dbaa3b898c98fd66c4c6839abc6efb1903c988

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