Malicious PDF — malware analysis report

Static analysis result for SHA-256 858ccab5f7a2b4bf…

MALICIOUS

PDF

51.0 KB Created: 2020-11-04 17:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e65e26cbf8e167178b5756401e257bc5 SHA-1: d96f007e757451d5fa07b6a2db30de4b5ddfb0d6 SHA-256: 858ccab5f7a2b4bf379c61d791ca2590b0130ab1310b42926597b60887280aca
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://cctraff.ru/123?keyword=greater+spell+specialization In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f922ea813a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f90ec8cb9994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f89096ef2fcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f87a85e556ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f88c60fe37c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f870133e7fb8.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/gosujijupavoresun.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/zufukisomaxifoxugiz.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/les_algorithmes_informatique.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/91838621629.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/figurative_language_powerpoint_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/joriwivedenokafuv.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/perovimida.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/nirebuduforezebenuf.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/sosokojiniju.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_off00008996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8996 5008 bytes
SHA-256: be395721ea8c1ad8a7a2213ec01d593b76462e00e11e46cc9a9130ce180734d8
font_01_sfnt_off00009ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB6 10644 bytes
SHA-256: 03488349affb2b3850100a5f52a224cdec018f58f85f68f2b6cb2f5a7e5f051d