Malicious PDF — malware analysis report

Static analysis result for SHA-256 7538ddd2af4befa5…

MALICIOUS

PDF

38.3 KB Created: 2020-10-08 00:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a5f6cb760f4f00fdc9895451bf102438 SHA-1: e1fc7e381a9a53388bca86e37729f3cd0de43e71 SHA-256: 7538ddd2af4befa593431a5e630c176f4eda430419f068165791c731b0968cbb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for search engine optimization, directing users to a malicious URL. The presence of a link farm and a malicious redirector strongly suggests an attempt to lead users to malicious 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://gettraff.ru/strik?keyword=bill+evans+autumn+leaves+piano+pdf In PDF document text
    • http://files.gwmarinesportsscubajet.com.au/uploads/1/3/2/6/132680933/vewavuroditefipazefo.pdfIn PDF document text
    • https://site-1040251.mozfiles.com/files/1040251/zibezekuziwekomusuzik.pdfIn PDF document text
    • https://site-1041695.mozfiles.com/files/1041695/niroxikijiko.pdfIn PDF document text
    • https://site-1039153.mozfiles.com/files/1039153/bokorenusulufuwuwudizapiv.pdfIn PDF document text
    • https://site-1039834.mozfiles.com/files/1039834/18255456208.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/puvuzivazakox.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/1/0438/6134/4406/files/25096714340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4349/9677/files/how_to_cite_a_book_chapter_bluebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/55535089417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce30ceb2-ee76-4855-a982-662dca5917dc/kariv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6ae968-12b5-4c72-b7bd-eaa3b21f5718/kojofirilodogavupib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d7e19d-6734-4791-918b-ee93ff734332/85891234600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff9b5ac-8a90-4014-acfa-2bcaad9b57d2/65158325997.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_off00004e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E82 5200 bytes
SHA-256: 26135627417e92210ac087fc230e539e19c25c83a36aa622a6dc561edcd42414
font_01_sfnt_off0000602f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 14260 bytes
SHA-256: b689fd88d907521f95ad8622164a55ae1bbf5cc7c1522c28600128da220ebe91

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