Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c2c30cccd4b86b…

MALICIOUS

PDF

44.6 KB Created: 2020-10-03 13:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5832c365ddd7b17b96de172546b62f88 SHA-1: ea0518cd365f5ce377fe0cc0ba07cbd90f9c5859 SHA-256: 23c2c30cccd4b86bd447cd18627c18b8af20e55ff5397cf2f1fc48a69860a37a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier strongly indicated maliciousness. The document body itself is largely unreadable but contains a URL that matches the malicious redirector heuristic, suggesting an attempt to lure users to malicious content or manipulate SEO.

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=40+meter+ocf+dipole In PDF document text
    • http://jukebud.redeemernewton.com/uploads/1/3/2/6/132683008/paginowevugalap.pdfIn PDF document text
    • http://zisojegol.partiesnpresents.com/uploads/1/3/1/4/131453853/wefubisulasa_paboxa_sidexi.pdfIn PDF document text
    • http://kowelone.alyssafeaswork.com/uploads/1/3/0/9/130969844/4714154.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/1/0432/3727/7855/files/arma_3_csat_overhaul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2735/1717/files/yamaha_dtx_502_manuale_italiano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/8776/5160/files/mibakevibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5940/4191/files/22459500156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2906/5639/files/mepudevorijuzogukalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/ken_coleman_show_resume_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8579/0358/files/tipuguborim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4693/5969/files/because_i_could_not_stop_for_death_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/jisegedorelut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4339/1141/files/1978_cutlass_supreme_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4098/0643/files/24321998328.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_off00007112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7112 5048 bytes
SHA-256: db5cbba6d4221a8862c51a77c72f3875be86cc87ba44c4e0abe2ed624061f727
font_01_sfnt_off00008230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8230 10464 bytes
SHA-256: f8b4be4a633376f7e7937e1620453d66b46811b5cdaf5a826207f3b381d83edb

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