Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec41a7a37e84e5a…

MALICIOUS

PDF

79.7 KB Created: 2020-10-04 13:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bd4fd202102d74f43b66e7496d52a5a5 SHA-1: 66a8d59d0b373d1243369c565f4e50fa21158adf SHA-256: 4ec41a7a37e84e5ae4b45df894c6d1b4ca59b36b5e882d4a17e0a345a210c0c7
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://cctraff.ru/strik?keyword=pdf+gamma+distribution' is directly associated with this malicious activity. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lure the user to a malicious site, likely for phishing or to download further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=pdf+gamma+distribution In PDF document text
    • http://kovolamun.glasgowfad.com/uploads/1/3/0/8/130874683/labum-rugoru-gixenu.pdfIn PDF document text
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdfIn PDF document text
    • http://rukidibo.mauemusicstudios.com/uploads/1/3/1/3/131380005/vexenanatumuxuwos.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/jopigudodotez.pdfIn PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/95247318105.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/1/0483/8673/6286/files/does_lexus_need_synthetic_oil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/43289615234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0015/9646/files/61817040668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/sas_scan_function_space_delimiter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1910/7993/files/93201989228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/verses_about_community_outreach.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 5336 bytes
SHA-256: 7c879c1533e6b315f7de6bda90641c46dcf0fdf65ea43a23710db65cd611e8a1
font_01_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 18376 bytes
SHA-256: 79aa3cebeaac9319b628a12140ffe2ad0ad3d414a77e601a9707b7e616292497
font_02_sfnt_off00011a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A38 16724 bytes
SHA-256: 295654c64c04c72868246af9a7cd3adfd6c5cc76b96261fe7708168a2e6a4d1a

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