Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaeaa23fd3a390f…

MALICIOUS

PDF

61.3 KB Created: 2020-10-07 00:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5f1c3f06f4b36595d6eb07ff660643ce SHA-1: d44f939ea3baa610fe4c2dff47e748a7c62ea876 SHA-256: bcaeaa23fd3a390f25ea75b43ce331d9bc4c3b0ce72cae790943e1edc6bc9b09
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, specifically 'https://gettraff.ru/strik?keyword=anexos+cutaneos+de+la+piel+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious content. The ML classifier strongly supports the malicious verdict.

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 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=anexos+cutaneos+de+la+piel+pdf In PDF document text
    • https://site-1041594.mozfiles.com/files/1041594/litijapepoxigor.pdfIn PDF document text
    • https://site-1038836.mozfiles.com/files/1038836/67649008136.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/wekilobamowi.pdfIn PDF document text
    • https://site-1038627.mozfiles.com/files/1038627/kururu.pdfIn PDF document text
    • https://site-1040099.mozfiles.com/files/1040099/vivij.pdfIn PDF document text
    • http://vajan.talltalegaming.com/uploads/1/3/0/7/130776445/4041538.pdfIn PDF document text
    • https://site-1039828.mozfiles.com/files/1039828/monazuvuxedopukivepi.pdfIn PDF document text
    • https://site-1040665.mozfiles.com/files/1040665/95795131534.pdfIn PDF document text
    • https://site-1039488.mozfiles.com/files/1039488/96353495618.pdfIn PDF document text
    • https://site-1041851.mozfiles.com/files/1041851/jujanajejozijinojusurur.pdfIn PDF document text
    • https://site-1044416.mozfiles.com/files/1044416/40913780857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA222 4992 bytes
SHA-256: 26cd46d303bbd8218413e9021e91a9a95c7999d13208edc20d23ad8267723dc5
font_01_sfnt_off0000b335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 11488 bytes
SHA-256: dc96a174284b77270a5516c8172295fd23fb05800eb145be349e210b61f4fc49
font_02_sfnt_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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