Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9747d8d492ae19…

MALICIOUS

PDF

45.8 KB Created: 2020-11-05 09:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 016625948f899dd02b98e4baf555804a SHA-1: b1e34547ebce777235a0b19b78d4b640ef4ceb18 SHA-256: 3d9747d8d492ae19e95597a6a71c6d62f2cca27e7efbb539a1e308ae878155a0
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, masquerading as a repair manual. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or phishing attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/strik?keyword=frigidaire+refrigerator+repair+manual+pdf In PDF document text
    • https://somanenor.weebly.com/uploads/1/3/4/4/134472611/7096254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fa2609260010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f89d19b9d575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f892192803dd.pdfIn PDF document text
    • https://malalufapavi.weebly.com/uploads/1/3/4/4/134481779/pomoze.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/lomupivujid.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/777978.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/078471bf-948e-42b1-8804-75fef3d4319e/46787414224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ca3958-297d-4892-a397-8e3d416dcec1/pewabogafaxawinewiserado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c649847-c9ac-4d1e-9552-c6dc00cb5d9a/wofirexusaniwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f01d42-049b-4ba6-9d55-297c49df78bf/13821020252.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_off00007429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7429 5140 bytes
SHA-256: 6dd289f9af901a625fb67719e878d1ca7a2147588d1e8fd64960b1080b02025b
font_01_sfnt_off00008599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8599 10680 bytes
SHA-256: af7e21881fbdc7f810f41e7047fd17d14e9cd2f89d6c9d40e1eeb6ef387958fc

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