Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e67945436a32e80…

MALICIOUS

PDF

40.8 KB Created: 2020-11-04 00:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b3d1272cabf0a7d8ad7ae1d26228ac27 SHA-1: 336130e03238d70a0af96c960ba9676f21bc136e SHA-256: 3e67945436a32e80eb69879a4704458ce40e7e7c7faa19c9c1b3f5cda3670d66
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for children's content, likely to trick users into clicking the malicious link.

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=dragon+song+youtube+for+kids In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5f9ef4b7808e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f891ba278207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f8beef709e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5f93ea2d74f87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f92a5a94b710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f876a8796f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f86f9722771d.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/2258194.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/d26353a63e9b0de.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/fapulinoloti.pdfIn PDF document text
    • https://zozunane.weebly.com/uploads/1/3/4/3/134316446/vubinumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f96db2a0d418.pdfIn PDF document text
    • https://rubisese.weebly.com/uploads/1/3/4/5/134589844/8ff9e3.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/somamere/bagepatijojejamejev.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_off0000615e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 5348 bytes
SHA-256: 65eb0a206809144924d085f7f76ec91d502d2937c5a253a7d962e4854a43a42e
font_01_sfnt_off000073a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A9 10280 bytes
SHA-256: 3cf38aa3290a079e5d63a3a2433a14995d63f1501ab79f49324649fbd5f673ef

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