Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ca475da3f37804…

MALICIOUS

PDF

42.1 KB Created: 2020-11-03 13:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 71075537cbcde1b8e64f39186282b1c2 SHA-1: df6c91e3569da6b5007f9e0623e65e568347092d SHA-256: c9ca475da3f378049a8e93277ca454ad602bc2c1b8f3f7506a77b015afe73180
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.cc/123?keyword=dod+letter+of+authorization+loa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5f8bb6e2501a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f99d591ae8ef.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/jadudusujuje/96664035838.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/c_nmr_correlation_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338e5cc8-6da3-4e43-adc9-311fe3863dc8/mugop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc64ad9-c25a-4c38-b3e2-8d1cdc53979d/88270913819.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/37615848949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68f5643-ad32-446e-83c5-d3677b27537a/39129108745.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/behaviourism_by_watson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76c821c-dc18-474e-b006-bd7f23cb4831/kesomezofejafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a28b16-5a8f-4d32-a7f7-50100202115b/the_nowhere_man_beatles.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/gekixisurog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a06a59-f435-489f-a4b2-d25e77223f53/83254044851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6b29ab-74ff-4a39-820e-6a64a9629f15/13943535019.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_off0000667f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667F 4864 bytes
SHA-256: df306d15134d147636a1c95808915ac975f8945336c2c3b95b8a7b4088e4a6bd
font_01_sfnt_off00007708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7708 11176 bytes
SHA-256: fc63d7f2dd955e0cecc1444570e5f306708fced03ad7147a1ed9089e51be467d