Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cf1fc3a380e549…

MALICIOUS

PDF

54.3 KB Created: 2020-10-03 15:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a2964039a3790f04b5f690c9e56db5e SHA-1: dc8dc70f42b0721e6fa4ac83fcd4a7a6d00a0509 SHA-256: f2cf1fc3a380e5496bfbfd87dfe8c7d02fc9a53c4a806428233df7ea9f91093d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and contains a link to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which point to SEO-optimized PDF files. The primary URL identified is https://cctraff.ru/strik?keyword=classical+monologues+for+women, which likely serves as an entry point to a malicious or spamming network.

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=classical+monologues+for+women In PDF document text
    • https://site-1036883.mozfiles.com/files/1036883/50721212957.pdfIn PDF document text
    • https://site-1037193.mozfiles.com/files/1037193/rivufisotatiki.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/34755095704.pdfIn PDF document text
    • https://site-1040099.mozfiles.com/files/1040099/mapilupujiselabojet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4bd078-fcd8-4bce-bfd3-45c4b9eb5957/gugegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65b40bb-0e4a-4865-b147-ddd6faca9a64/89362643634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3fc945-5c8f-45f9-a57e-62b2b860ece8/bekivevokaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0481c4be-2e64-458d-8462-bcc11e8e9ae6/23104408517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4758/7492/files/xigukepuwatudobinojoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4023/4911/files/zokadazulumoxetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1555/1651/files/atlas_hematology_free.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_off00009868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9868 5200 bytes
SHA-256: 83af10e24852e774cfc376b7cca0887f3b0a1be8e277512271fc15ce2cae22d9
font_01_sfnt_off0000aa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0E 10376 bytes
SHA-256: 8ead821aa6fc14e30e7d2aefb161300c5e68d3478a96e82f972610b38c1a1dad

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