Malicious PDF — malware analysis report

Static analysis result for SHA-256 f870b308f4fb01fd…

MALICIOUS

PDF

39.7 KB Created: 2020-11-01 21:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e8ad7ea5042ddcf9dd7d4f2829f03df5 SHA-1: c6ce35a35bcf3beddae5ca719aa7992d69640bf0 SHA-256: f870b308f4fb01fdcf4a3e550fb4461bc23bcff0b550dfef21a403c8bbf74c65
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, many of which point to external PDF documents, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential for user redirection to harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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/aws?keyword=randy+wright+brady+corp In PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/xazunanuraga.pdfIn PDF document text
    • https://jivarogogujuno.weebly.com/uploads/1/3/4/5/134513891/roliv_padelufonesus_keluxawaveduwo_bagateg.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/e427e501-8e97-4f67-b617-0c32880e2ad6/muvawixudavanel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5195/3557/files/valor_presente_neto_definicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/difference_between_automatic_and_manual_transmission.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4041/1325/files/98492143176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8010/9218/files/vemukamagexekodavaxuwen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/2020_buick_enclave_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0398/6184/6209/files/23870071305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6612/0609/files/gasipifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ee2e53-d5d0-4240-abd9-5586c53f0f82/musopupon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7048/1076/files/fejodelukadanuferosejog.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_off00005b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B14 5468 bytes
SHA-256: ec25296333010e0e1fdedf263116d14c74f0edff598824a382e64406a9ec47f4
font_01_sfnt_off00006dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC4 10812 bytes
SHA-256: 7f2eb5cf7d0ce516e98bb745fa5da6e5995362569b0d8e994440f32e8e3e09a6

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