Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b0879009786d49…

MALICIOUS

PDF

48.5 KB Created: 2020-11-03 00:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2cd81392b5ba0b4fb66aedc11febe1ba SHA-1: d2e1cfe6c5d43a6329121a50f3070bb06d4d1973 SHA-256: 91b0879009786d49aca72a4d67694cd1ff62eebcf888040c35849f46683fdcd5
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://ttraff.ru/123?keyword=big+lots+empower+self+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5f9bfe4c5932d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f8f44dc6728a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f885b1671c17.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/vibumoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5f9c6c0b8acde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fa0830b63995.pdfIn PDF document text
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/vusikebujakixem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f95d2f29e83a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_5fa083ca70d74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5f9e787c79b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f872bae40fc7.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/davolazupivowi/95081500197.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/xokivojofetidawupok.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/21155673847.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/moviebox_apk_download_kindle_fire.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_off00007439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7439 5500 bytes
SHA-256: 20405dc07819b35049c966f5d39978f9f93563b2594750bb31e958425d3b492f
font_01_sfnt_off000086e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E2 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00008f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F70 10912 bytes
SHA-256: ff410fa8a6336dedc8428a228c3cee31a9b241285671edf851dc234c67d71a1c

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