Malicious PDF — malware analysis report

Static analysis result for SHA-256 241a5482b2bfadb1…

MALICIOUS

PDF

44.9 KB Created: 2020-10-25 13:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bf567109452c11ddddb4296069ddd71f SHA-1: 3d012dd34286b0e537923e3e3b740bbe2d695b15 SHA-256: 241a5482b2bfadb1e7600baacdbd00bc995af19533bd529a2f2b92b5f4e35f82
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious infrastructure, disguised with a book title. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the redirector link finding.

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=libro+fundamentos+de+la+administracion+lourdes+munch+y+jose+garcia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5f9151e9374a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f925ba23bda5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f8e8708ba85c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f91306203768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5f953f4b458a0.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/1/0502/1079/9796/files/5493875394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6826/0004/files/watusolokabetej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/rd_grade_math_standards_nc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7130/0268/files/pabapasejomilus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9406/3269/files/87858657823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2516/0086/files/oblivion_item_level_cap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8309/3910/files/befuxodavogutaxaboxuva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8763/2813/files/lady_bird_lake_trail_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6499e9-e3e3-4a53-aab2-85ebd5bd1d5d/40774246554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66eb7d8-49c4-4c4f-b0c6-69a52b693127/vowudorepetimogutat.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/73011582517.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/believe_in_yourself_book.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_off00006de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 5692 bytes
SHA-256: 27ade7c097ff21e78cf3293d83e7bc910e0b65af693b0ba6e654cb9e38f9d825
font_01_sfnt_off00008121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8121 10696 bytes
SHA-256: 768733075ef2def25d87fce504a99631cc94a8ce3c257dcabce9f2aaca22c1d8

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