Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9a88edbd46fe22…

MALICIOUS

PDF

44.6 KB Created: 2020-10-30 21:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bf26b3b5cffc3dba71ecf275eba43bf7 SHA-1: 3692cd2834a6b2918114b406d9b03dedee0e5eb0 SHA-256: 3c9a88edbd46fe228cd0d16a16e935be4084d334b9550ac5a52f494b94773ab3
94 Risk Score

Malware Insights

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

The sample is a PDF document that contains a link to a known malicious redirector. The document body, though heavily obfuscated, includes URLs that appear to be lures for downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms the intent to lead the user to harmful infrastructure.

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://ttraff.me/123?keyword=software+testing+and+continuous+quality+improvement+third+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_5f997de95843a.pdfIn PDF document text
    • https://ragidogatekanex.weebly.com/uploads/1/3/4/3/134388076/libibavife_zoxojebeseze_sizujas_katigajalibesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5f93344ab714f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5f87c3142b7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f9179bb048a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f87b151c3898.pdfIn PDF document text
    • https://luxapojago.weebly.com/uploads/1/3/4/3/134327771/29aac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f95e13080e4e.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/118d882e318410c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_5f9a792a8a18c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genedonapubefe/zikozobo.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/89512965249.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/remington_1900_serial_number_lookup.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/50_exercices_pour_avoir_confiance_en_soi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0B 5936 bytes
SHA-256: 62973d68f8d7044da07f85b7d69750a5ca0263fd35ce2a98890ec191a65de9f5
font_01_sfnt_off00007319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7319 10432 bytes
SHA-256: 2f05f10f14504b9ba94927c23f8555b79375ffe8b530a641c6cc80a9ad832e7d
font_02_sfnt_off00009693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9693 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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