Malicious PDF — malware analysis report

Static analysis result for SHA-256 128f30b2e6c0364b…

MALICIOUS

PDF

66.9 KB Created: 2020-12-18 18:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8f9998859edfad008de265f0e5c772a9 SHA-1: 9634afd4efe2c6e1f145cdb19c0adfbac4f7cc17 SHA-256: 128f30b2e6c0364b66c56b9f58235ce02dfd20925f63619b497d7ea1eb8698f8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=naafa+convention+2020 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_5fcd963aafd1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_5fa802112ce59.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/sukap-vowaxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8c89f41a19b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f8b4c482277d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fa0bd11ddfde.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/3ad2a172-3860-412a-962b-c66229071a1b/44343804589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76a0d3a-1a22-46c2-95e5-15b873eab158/niwav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d076a33-bae7-4670-9996-19f6f547e542/spiritual_laws.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/tuwidekavigix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbef33d-d46e-4100-a0b3-41388d2f922b/philadelphia_crime_family_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545005fd-6076-4e67-825f-b3ee2e351e98/the_secret_telugu_ebook_free_downloa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faecaae5-787f-4885-b372-010dd1ca4262/wetodojezulawobanebes.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_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 4872 bytes
SHA-256: eb282fca1563d23c5ecc5c32022b92a976a825316cefb4e61bed6a897f9ffe80
font_01_sfnt_off0000dbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 10364 bytes
SHA-256: 8e8f5efec62ccf2268d5debe6ed1de528b04365184ae2dcb41f02945a36208fe

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