Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a904d123e329ed…

MALICIOUS

PDF

44.1 KB Created: 2020-11-02 22:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 038749ac544e264521edb44f9b10c401 SHA-1: 29430e77df1e59d5029ddec4951dbf38d27c51db SHA-256: 93a904d123e329eddb4548256084ca9f790aeca233147c59f124a37918e2f147
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/strik?keyword=letter+of+representation+audit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f901e312edd9.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/382f8cca1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f8eba55203ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8b758ba58c3.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/kidutavide.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/xutuwage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/357be091-9479-4d2f-b23c-4d2e9c395a74/puvodigirojiwefujibar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69dbcf55-17e6-4801-bb10-5ded8d65c7b3/cs_go_torrentle_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158b041d-d395-4e95-bb78-d5905dd2bda6/52905648160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3831/7464/files/72796147948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b5861c-84f4-4417-a362-36db1d927f01/jaxorikifututukowata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9886/4800/files/16039241991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998e3580-ae65-4da3-bcc0-06675bd8067b/68610321675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075a2bdd-d23f-4a4e-8e78-b92adbc22ade/edison_bulb_chandelier_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6131 4824 bytes
SHA-256: 1b143ae542d5405d2912873e0995b08921407e2f2d026c5b6c27fa6d3ff4de59
font_01_sfnt_off000071a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A0 10532 bytes
SHA-256: 9731a4e41b5e3876886e61f8f193073933be58688fcba7aaeed256e92321674a
font_02_sfnt_off00009579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9579 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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