Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5b06943e7b1f25…

MALICIOUS

PDF

46.3 KB Created: 2020-10-10 23:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f0680bae889ae323dd9f52e970b5de65 SHA-1: db73809063d634f78def2eceb256d50f1fda8dde SHA-256: 2a5b06943e7b1f25f1026f740e6fe89a735fa37bd6d42c11377589496bca11fd
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential distribution point for further malicious activity. The ML classifier also strongly flagged this PDF as malicious.

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=big+data+analytics+hadoop+pdf In PDF document text
    • http://files.artsbykhamoshi.com/uploads/1/3/1/4/131406403/fiwibolukoluko_jarelurupemum.pdfIn PDF document text
    • http://files.springbreakkenya.org/uploads/1/3/1/4/131407089/galejoxovota.pdfIn PDF document text
    • http://files.jenkinsfamilyfarm.com/uploads/1/3/2/7/132740209/vuwegusoxuwojosemur.pdfIn PDF document text
    • https://site-1043694.mozfiles.com/files/1043694/14744045913.pdfIn PDF document text
    • https://site-1038360.mozfiles.com/files/1038360/112628335.pdfIn PDF document text
    • https://site-1036855.mozfiles.com/files/1036855/kovisuputetalulebegaje.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/femusijagetokosufipozoka.pdfIn PDF document text
    • https://site-1039201.mozfiles.com/files/1039201/zugivubifejopojedexodaji.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/1/0482/6870/5956/files/iowa_high_school_wrestling_stats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3454/0704/files/ea_sports_cricket.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6242/2421/files/jinubewarobavulijuvugox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5065/9751/files/spanish_springs_library_today.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5850/0262/files/dispositivos_de_salida_de_una_computadora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2457fb-b64a-4d62-a3d5-248cf9a76660/wefabufojamenuvenej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b863725-b934-478c-94ec-b67ec6b0ea43/vufinapupowuzuninelubobov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a2c829-3293-4549-8ef7-cda0c06c3cef/40568822673.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_off0000752c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 5472 bytes
SHA-256: a923ca6a4b2539e914c14767e9e1fec33ce986555431316d98bed713a07d4cc4
font_01_sfnt_off000087d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D1 10584 bytes
SHA-256: 86f6efdd84c3ace6ed9e25745796aa5fe68c451b635db8ac465c6cdc38f9a630

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