Malicious PDF — malware analysis report

Static analysis result for SHA-256 433e4589f82dde92…

MALICIOUS

PDF

45.5 KB Created: 2020-11-04 10:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c013c531b8474f4e584727694df7f866 SHA-1: 2cee6786cd9e6506df7e1ae57fcd420c80ae15a3 SHA-256: 433e4589f82dde92e60b6d1f826e9abdaec97bdbe2bb5021ad160342c4568aa7
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/123?keyword=letter+of+recommendation+sample+word+doc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f9290d084bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_5f9ddedb9f8ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5f9b2e774b959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_5f9c715c5eb46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5f9656d77b113.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/4b80fecd47574f.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/jedasaber/15405204565.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/51787059372.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/77764380883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9808/8628/files/la_z_boy_spare_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/rusimi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/the_nine_abdominal_regions.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/incineracion_de_residuos_organicos.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/genetics_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/2003_honda_civic_service_manual.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_off00007413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7413 5336 bytes
SHA-256: 4e838400a37d6ff7102960990b76de6130982a7d4fee58165ceccf394a7eabda
font_01_sfnt_off00008637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8637 10264 bytes
SHA-256: f6c84e8433a385c0786995dfabef64c270ebfd86966274735737628a320ea8a3

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