Malicious PDF — malware analysis report

Static analysis result for SHA-256 326c5673e1388c91…

MALICIOUS

PDF

36.3 KB Created: 2020-10-29 17:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 28d3f9ca2224b9761c90bf42c21d851f SHA-1: 1783e3507c9cbe18da98fc60abf29bee6f6527be SHA-256: 326c5673e1388c91453f1925c56dedddca2b08767ebf9a8b207689212b5239c0
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.club/123?keyword=five+nights+at+freddy+free+download+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f8708809192a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f893a5f91f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5f96c647d93ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_5f98240be56ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f981d4fc409b.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/xovajukoxin/xojomemifobona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59988c1b-fdcd-406c-9b7e-7d86699cc849/el_papiro_de_ahmes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bec63e8-b8a3-4e05-99ff-86bf58fb3254/labixokuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/gaposemimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a51a69-c917-437c-897c-305a0aba0b8b/66450123336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d793fe5-0e25-4c72-9b7c-4aadd4f45e0b/82271695149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10dbb514-ddf1-4a2b-9757-6406be4783cb/97882451904.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/chinese_characters_stroke_order.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/63539556908.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_off00004ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBF 5576 bytes
SHA-256: 61cd5f60211ca119f9d3fa9018a5f3e82e45a341d025eb8afbfb347c9fbc7d55
font_01_sfnt_off000061d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D9 9976 bytes
SHA-256: 8d19893d13fff81d9a828e4c43216017d4b85d0b647ada060bab4da3d9bc75dd