Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5da0c8a3c18735…

MALICIOUS

PDF

74.5 KB Created: 2020-11-11 12:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 38d19b2a31d61eccd89e505e5c3b6e23 SHA-1: 5465a826cc7e4c47dbd9e5023a63df01fcf5ce16 SHA-256: 9f5da0c8a3c1873592109cd6c341c0bad198dd3cea5740518965b4d60ea41ffc
154 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://ggtraff.ru/strik?keyword=birds+by+joe+new+jersey, is the primary indicator of this malicious activity. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?keyword=birds+by+joe+new+jersey In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f932ecf84334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8ab3bdd1c00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_5fa36aff4fc03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_5f9ec6ff22cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5f9aeb975f671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fa36ab0d0055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/39127996451.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/tutimafafowosezunuwuvel.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/sopakakumabufapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23cfcaf-58cd-42c3-9959-d02b5bf4656a/homework_folder_cover_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18c1884-149e-4a2e-b057-fe83a6bb6ff6/sodupil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781e4063-7e16-4dcd-a8db-bccf53bf7a3c/31969678286.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/5885343399.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/suros_regime_ttk.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/xukekijikamenumipimuwezoj.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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 5036 bytes
SHA-256: b726c525af8e6769ab5aecb92cabf672a46d09e52fe239a0d8a73771fb8d724b
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 10520 bytes
SHA-256: 8d4b4ad7f71cee82e75c0dabdd3338f9d01173bed2e3fd8e6a638e1b08495fb3

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