Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90e8b06d25c2c2f…

MALICIOUS

PDF

46.4 KB Created: 2020-07-08 13:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: d436aa50ef9be3c2f8c7561883026412 SHA-1: 2697f9f57a8ad1b0335c2f03139804b2d3c31774 SHA-256: c90e8b06d25c2c2f6d02171e52d564350f6f8e58300525dbdffa740dde554491
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links directs to a known malicious redirector, indicating a phishing or malicious content distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=harnessing%20the%20science%20of%20persuasion%20harvard%20business%20review%20pdf In PDF document text
    • http://files.mr-stevens.com/uploads/1/3/0/7/130776864/zoxakaso.pdfIn PDF document text
    • http://files.batrssocal.com/uploads/1/3/1/3/131384789/vipibifoxoteroxu.pdfIn PDF document text
    • http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdfIn PDF document text
    • http://files.kaynoteonline.com/uploads/1/3/2/7/132712514/tenup.pdfIn PDF document text
    • http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdfIn PDF document text
    • http://files.stcharlescatholicchurch.com/uploads/1/3/0/9/130969532/vidimonamolezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xebekuno.files.wordpress.com/2020/06/91701266915.pdfIn PDF document text
    • https://dewotuf.files.wordpress.com/2020/06/12996268964.pdfIn PDF document text
    • https://xokiwija.files.wordpress.com/2020/06/wakopufal.pdfIn PDF document text
    • https://solotimo.files.wordpress.com/2020/07/24440555556.pdfIn PDF document text
    • https://dewufuvep.files.wordpress.com/2020/06/fodubufo.pdfIn PDF document text
    • https://xezaguduta.files.wordpress.com/2020/07/11677221258.pdfIn PDF document text
    • https://xizipif.files.wordpress.com/2020/06/siluromudimijuwaroro.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7785 5520 bytes
SHA-256: c5a93b0c4e5cc445ff9d581b41a63434cad89cadeb7ee7cd84e5c94180c9b7b8
font_01_sfnt_off00008a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A46 10024 bytes
SHA-256: b0fbe41e04d182110cea5e382b7fcc8c6fe4b3bc3610ceb73bb524e9c2bb2ce1

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