Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc7f3525473a0f1…

MALICIOUS

PDF

33.6 KB Created: 2020-11-03 11:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2785a2b8aff2663cefa248a00129b5bc SHA-1: 2d08c63b0e2433a72260496e0073d69c1b9e5cd3 SHA-256: 8dc7f3525473a0f18d04f20dbbbb3835fe41f80c16dfaad2721052267e0f460d
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.ru/123?keyword=classzone+calorimetry+virtual+lab+answers In PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/devamet-derekaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5f93b3609cd0c.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/3089918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5f99148e179dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f87c0daeb135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f870ae3b3a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f89b25b6f4af.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/jamokaroxoj/handbook_of_poststack_seismic_attributes.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/cbse_class_11_biology_ncert_solutions_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/watch_free_spider_man_far_from_home_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce36dba-8bf9-4f12-84c4-81248cbcbc46/sufujemadis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e404a8e5-c1dd-486c-b3c2-4de204151091/zatomatalitameg.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/nuvetuti.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_off00004652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4652 5296 bytes
SHA-256: 9cdeb965fede22cc8f8bf4f6965e183814db118efefb01d701d91ce260b4d296
font_01_sfnt_off0000585a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x585A 9668 bytes
SHA-256: 5238285869b746f06e8b3accbe59d8512f00fdc4f7622444b9ec76e5b54b9e61