Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a66aa655ccc3d15…

MALICIOUS

PDF

44.6 KB Created: 2020-11-02 21:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b5c64e290b543f7356d5972ac012956f SHA-1: 144c5a37fdf5b672f416db6a18285c6a1b99204c SHA-256: 6a66aa655ccc3d15ab255f142d36275d0321e2d8296c2b8d5a56888b6d67c28e
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://cctraff.ru/strik?keyword=urchin+background+d+d+5e In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8d03b8c90ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5f9cb30b04f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5f9c163caee15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5f9fd8456afdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5f974ffc107b0.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/ecbfe70.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/1/0266/9710/5599/files/61560600090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4182/3164/files/imagemagick_convert_jpg_to.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9586/5517/files/lewiperoguduratasotibir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760518fa-0360-4cc1-b2c3-918773513ec4/30060023944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1491/2661/files/tivowanepelod.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/courses_offered_at_makerere_university.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7291/9963/files/camp_creek_middle_school_fulton_county.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_off0000708b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708B 5308 bytes
SHA-256: 26314e4c1515c3ad163dc5a57b41951501624c6d79d67f03d10c2b6286a11249
font_01_sfnt_off00008296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8296 10216 bytes
SHA-256: f8364de40d8fc38c212fc93d1831a8a38d5581eb2a5ac2339826157aa8adc1d6

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