Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf64de35b7f6838…

MALICIOUS

PDF

52.7 KB Created: 2020-11-04 15:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01b9d9ca6e9c6f3a67890dfd619b2448 SHA-1: 43c70170278cf239a3ea2f4d23ea7f3a217f851a SHA-256: caf64de35b7f6838c1b85b267151a099f1f3669faeb858206e1933f2906bd09b
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/strik?keyword=st+peter+catholic+school+jefferson+city+mo'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link suggest an attempt to lure the user to a malicious site, likely as part of a phishing or malware delivery campaign.

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://gettraff.ru/strik?keyword=st+peter+catholic+school+jefferson+city+mo
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f8c625b7904d.pdf
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f8f2b1d921dd.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f8b4f61e5b03.pdf
    • https://cdn-cms.f-static.net/uploads/4443588/normal_5f9d3813a71c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jamokaroxoj/janafibijazozix.pdf
    • https://s3.amazonaws.com/jamokaroxoj/jarimisakikilifa.pdf
    • https://uploads.strikinglycdn.com/files/9993607b-6744-4cd8-9842-77ee15f42dc6/18065062113.pdf
    • https://uploads.strikinglycdn.com/files/6e290d9b-5c90-40f2-b027-d0fbc6851bb8/nikotugetasevoke.pdf
    • https://s3.amazonaws.com/jadere/budaya_organisasi_terhadap.pdf
    • https://s3.amazonaws.com/xurixado/4k_video_downloader_license_key_reddit.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_off00008bed.bin
30926c7ed06042a7f3f007b9277248146816df2f5608dba06e7074cdb6c34acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BED 5536 bytes
font_01_sfnt_off00009eaa.bin
87294e9b8bd0c51800cd733891060938fba880fb5230fddaa7aa9ead68a034e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAA 12692 bytes

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