Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a4ea584413f10…

MALICIOUS

PDF

41.5 KB Created: 2020-10-30 01:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a8f4366d1ff5576267e2c28662c226f SHA-1: 8cc5eb98e6e022189ebf99ab079abafe217ccd5e SHA-256: f75a4ea584413f1027487221be30ac382efb78b9f3fd5ed190897452d5f75a00
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search results or distribute malicious content. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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=lee%2527s+summit+high+school+mascot In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f871310ad769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f916316bb17a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5f8945323fc32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f979bd6c66fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5f91c5cd20c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f97bd0970622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5f99f8629a293.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/1/0431/4277/4938/files/microwave_semiconductor_devices.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/paragraph_worksheets_for_grade_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4720/5055/files/rekupoxax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/tamasha_movie_script_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1044/8286/files/amplificador_de_volumen_apk_descargar.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_off0000636d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 5092 bytes
SHA-256: 0d2f15b6a01f0ce46963f66bab254901791b87883e6bdb0c89079847c34962bf
font_01_sfnt_off000074ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74AC 10836 bytes
SHA-256: 3951672d529416e4fb1ecbd4bb26e4c7cf1dae806ace341aa24bc20bccdd5b10

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