Malicious PDF — malware analysis report

Static analysis result for SHA-256 423429dc219bd8e6…

MALICIOUS

PDF

32.2 KB Created: 2020-11-03 05:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6d36e0d47b8d114b476d251c0cab91f3 SHA-1: 4f34bfaa408af6f29a92a9831b39c6d1f3b75daa SHA-256: 423429dc219bd8e67956ac2dbaae9f588cc09205f22c61f63bad3c0dfb073a9d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure. The document body, though heavily obfuscated, contains text related to "bulldog puppies for sale" and a URL that appears to be a malicious redirector. This suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

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.club/123?keyword=bulldog+puppies+for+sale+in+massachusetts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_5f9ed10c87df8.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/6003457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_5f9bb7b12ae81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f8cb70452ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f8f054a715a1.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/1/0506/5585/4790/files/run_1_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/50854717980.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/promissory_note_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/the_57_bus_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/ashleys_furniture_cc.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_off00003fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FB8 5616 bytes
SHA-256: 12ec17d5f40071ceff15dfeaecd1109ecd80c66d1ed5a54db440471a76656099
font_01_sfnt_off000052ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52AE 10208 bytes
SHA-256: 488bd1f9de599b18ad8143d80b542d1a12abd16997f16bf060e6410f0a1e3a24

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