Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb9630822ba4db2…

MALICIOUS

PDF

65.5 KB Created: 2020-11-19 11:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1cfdae3bb848249cf63c8f0fa3b889e SHA-1: daf2e759450451389ba3c0a9ec8b063bf3827ced SHA-256: 4fb9630822ba4db20f57c73ef035221ce91e7485237f309390e41ccfe19e3137
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and the malicious URL suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=jtown+hot+yoga+maple+shade+township+nj
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5faf2f21c4eb7.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f9cb42963592.pdf
    • https://cdn-cms.f-static.net/uploads/4472206/normal_5fb49840c6a2a.pdf
    • https://cdn-cms.f-static.net/uploads/4454556/normal_5fa7c1ab7ce8f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baritexovopa/9591800094.pdf
    • https://s3.amazonaws.com/samopakamefap/scheduling_assistant_in_outlook_365.pdf
    • https://uploads.strikinglycdn.com/files/89f10758-9a4f-44ea-8355-97fb029fd3be/vesenaxunuti.pdf
    • https://uploads.strikinglycdn.com/files/47d6aba3-9fea-4068-b300-8fc15c9e1f07/57736387876.pdf
    • https://s3.amazonaws.com/betefowubevat/bejulixosuf.pdf
    • https://s3.amazonaws.com/gurafoga/codes_for_smite_pc.pdf
    • https://s3.amazonaws.com/potofaw/deferred_taxes_payable_on_balance_sheet.pdf
    • https://s3.amazonaws.com/redegelesibif/unit_12_ecology_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/76563ebf-f672-473c-bde8-d6db2a6a771f/cocomo_2_a_parametric_productivity_model.pdf
    • https://s3.amazonaws.com/redegelesibif/june_july_august_2019_calendar_printable.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c269.bin
70e3053255a7f217244f89f002207ddd4646a2b83db6a5230cff7fb2b1483247		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC269 5536 bytes
font_01_sfnt_off0000d536.bin
f437c63bc2bd1d3528555480f5e5043fd144f1e28094d2b2989ccb82137383ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 10476 bytes

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