Malicious PDF — malware analysis report

Static analysis result for SHA-256 334ab9d2b96b18ee…

MALICIOUS

PDF

38.2 KB Created: 2020-10-30 15:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 29e947cde49cd703c921d26cb52aa86f SHA-1: 757ac0f8e014321f06f65632c704325c1c4ce193 SHA-256: 334ab9d2b96b18eea935fd5ef0685499a11d2aaec0ebe9a7aceda13de4459c28
94 Risk Score

Malware Insights

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

The PDF document contains a link disguised as a helpful query about attaching files, which redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the embedded URL is flagged as a known malicious redirector. The document body itself contains obfuscated text and the malicious URL, suggesting an attempt to trick the user into clicking the link to initiate a malicious download or redirect.

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://cctraff.ru/wb?keyword=how%20do%20i%20attach%202%20pdf%20files%20together In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5f8aebcf7b222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f99ee0671282.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/nukik-tababi-wimowuweginulad.pdfIn PDF document text
    • https://degepuwenezeg.weebly.com/uploads/1/3/1/6/131607310/sakuguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5f9c0c9640749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5f8d07900e8ba.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/saxibafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f89c2c01d03c.pdfIn PDF document text
    • https://kulilopoxi.weebly.com/uploads/1/3/4/3/134375859/zaseniju.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/jaxesabi/49415514905.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/66910319315.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/where_the_red_fern_grows_summary_chapter_11.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_off000055d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55D3 5604 bytes
SHA-256: 57e053b9053b7334bd46212c437c74d41afe7113b3fc53d5600a7dfb2f1c3e1d
font_01_sfnt_off000068f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F2 10268 bytes
SHA-256: a638d644a9fb49754d33f711859ca5bfd9253aa475d1b0c8a4ac89e12b1753a1

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