Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb742b81bbb3f259…

MALICIOUS

PDF

48.4 KB Created: 2020-11-03 16:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8e0284aeef3eba240e37d4bf5514edf6 SHA-1: 25ad18aa7eddb325e36456bf48f1170613224e87 SHA-256: eb742b81bbb3f259efda8dcc5da74b962cf9fdbde37d13e15714dbfc051e753b
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://gettraff.ru/strik?keyword=timber+mmd+motion+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5fa090b9bf10e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f8b21952946e.pdfIn PDF document text
    • https://nexajatolotol.weebly.com/uploads/1/3/4/3/134308242/d0eb75a2fc.pdfIn PDF document text
    • https://zotexujefu.weebly.com/uploads/1/3/4/3/134322023/8588697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f9da54a03666.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/pixiwokafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5f9a52e996f86.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/relizibusavajuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_5fa08b3ed6d8c.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/rorives/environmental_science_textbook_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/sodusimosunabaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff25d29-4840-4e88-9d46-05a20cc75969/dofanabaduka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c85422-5a95-4bbe-9eea-e993fb01fc84/hypervibe_vibrating_platform_exercise_machine.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_off000067fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FC 4780 bytes
SHA-256: 5957894b1cea2f56a73682f8dcb8aada9c91f0ad8dd9fc7482c165a4794859e0
font_01_sfnt_off000078be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BE 4972 bytes
SHA-256: 682b84450bc33cc42afd79b2ad40526202744b2141e01d5671f4d3bb1b51d24b
font_02_sfnt_off00008997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8997 13216 bytes
SHA-256: 4a0be131eb53b031b3db7b1d84c03c636bf7b0b7db7e72f7185177bd8378ef38

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