Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a4c74e673f651d…

MALICIOUS

PDF

42.0 KB Created: 2020-11-05 10:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0a048c1e446cf8e26037e0777c53f32b SHA-1: 26a5c30abdba3347d5d378a5eb1a884d0b759059 SHA-256: 63a4c74e673f651d9b723e0d260021cc613caf0cb57fd109fee971ec139c167c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and contains numerous embedded links. A critical heuristic firing indicates that some of these links point to known malicious redirector infrastructure, specifically 'https://gettraff.ru/123?keyword=she+fought+alone+cast'. The document also exhibits characteristics of a PDF link farm, with many links pointing to external PDF files hosted on services like Weebly, suggesting an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the presence of malicious links is sufficient evidence for a high confidence assessment.

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://gettraff.ru/123?keyword=she+fought+alone+cast In PDF document text
    • https://paripipedaninez.weebly.com/uploads/1/3/4/4/134444050/6536000.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/206eb526c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5f9256e52ac8d.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/e21dba4.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/9cdad59cb.pdfIn PDF document text
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/pumibagologo.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/a6a967.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/4009451.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/rokuwapesu/journal_star_obituaries_peoria_il.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a39617-c27a-40b2-9b3f-fa1a998f082c/zonexefe.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/mcdougal_littell_algebra_1_practice_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/90742843230.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/vunijukozaxixibaw.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_off0000676f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676F 5148 bytes
SHA-256: cde2981f81cc705de82275f6affb1b2ecac3c61e705b950fcb06393e465ee2f4
font_01_sfnt_off000078fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78FC 10224 bytes
SHA-256: 87601bc9cfc0aa357cbe1d8bd59752a0b89e6044fd4550ea3970dde582f6a9cc

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