Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae7a615c08ba2b4…

MALICIOUS

PDF

56.4 KB Created: 2020-10-05 14:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e525009bf76c3d1aca8640d21b854555 SHA-1: ecd09478d5c07d07f8b05248e64b873b1e06591a SHA-256: 6ae7a615c08ba2b4104895f7b07ca2f042f07fae4672d1717439cc7ef94d65a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of SEO poisoning or a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

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=prens+machiavelli+%25C3%25B6zeti In PDF document text
    • http://bepotof.saludabaptist.org/uploads/1/3/0/9/130969959/2c3c1d07d8.pdfIn PDF document text
    • http://nanira.boundlesspotential.coach/uploads/1/3/1/3/131383771/potunuzekafimo.pdfIn PDF document text
    • http://kagibuf.thesurfprofessor.com/uploads/1/3/0/8/130874493/savonenure_perozinilivo_pupupidum_timupozojokag.pdfIn PDF document text
    • http://files.yourstoryunfolded.com/uploads/1/3/1/3/131380288/mebunenokagufinufum.pdfIn PDF document text
    • http://lezemur.monashgully.net/uploads/1/3/1/4/131483067/851083.pdfIn PDF document text
    • http://ligeta.darrinowens.com/uploads/1/3/0/7/130775961/3301778.pdfIn PDF document text
    • http://wupevi.francislewissocialstudies.com/uploads/1/3/1/6/131606490/04277e.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/1/0429/3410/8323/files/dopenululuzazeti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2630/0059/files/my_name_is_maria_isabel_chapter_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/3_way_crossover.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4984/2850/files/pifew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/40504970367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3450/4089/files/neighborhood_in_spanish_please.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_off00009bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BBA 5288 bytes
SHA-256: dc339b522e5a697522e92f3aded29790af595c60570f8d9aaa2d71a9d3398704
font_01_sfnt_off0000ad55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD55 12316 bytes
SHA-256: f218be04b7e33778707db22127eafe8d71674a1c4052de922b4b13dffd006c3f

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