Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d594b57ab8df7e…

MALICIOUS

PDF

66.6 KB Created: 2020-12-09 10:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 37ac1bb5a86999017bc62a8687cd3365 SHA-1: 28b3ffe28a0c4fee96242f2542603549d5c46c42 SHA-256: f9d594b57ab8df7e0d83186c089e2699fae4d6cba333d5a149606b915a51caee
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'Best Buy GoPro Hero 8 bundle'. The presence of multiple embedded links and the ML classifier's high confidence score suggest a phishing or redirection attack. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffmen.ru/strik?utm_term=best+buy+gopro+hero+8+bundle In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417817/normal_5fcafd84890a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fc71c15491e0.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/bc49c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407807/normal_5fc53bc7bb4d7.pdfIn PDF document text
    • https://kepamimap.weebly.com/uploads/1/3/4/6/134609022/fesutofedokexu-xivamovelov-ganapalaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_5fa7714c039b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_5fb940a9c0683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5f9d8e7024a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5f98a8c3ae42a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ca7740f1034a5ca83b63/t/5fcc513e978da30c56f30efc/1607225662841/mars_volta_goliath_time_signature.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe111c173fb5383b69a14c/1606291741059/xujirepibegebavemazo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc155cc8139af037648468f/t/5fcd54919aa2de0c64a3ba13/1607292051099/12815119703.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d650403f5353fd956949/t/5fc3bcf8145a8629dc22a969/1606663416766/freedom_1.0_6_apk_download.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_off0000c594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC594 5496 bytes
SHA-256: 220c6afb09a32b6014cc600f5ecfe0d4923dddf36d13de687bf6e91daf8a63d9
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 10868 bytes
SHA-256: beb87415f223bcf52daaed2a65c39448d58ccb10468cba269d52995a3af4a4cc

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