Malicious PDF — malware analysis report

Static analysis result for SHA-256 390f8cddb7bf630c…

MALICIOUS

PDF

48.6 KB Created: 2020-11-03 17:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 540ab30d570b89ced4a6d6a451643786 SHA-1: d838da46d6b9f1ef6c94d7cf6fc6004981e09772 SHA-256: 390f8cddb7bf630c54bfeece4929f4d77cf7076d9821736169fd93fbb084b4d6
94 Risk Score
Tags
free-cdn-ebook-manual-lure

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=game+engine+architecture+third+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f8b92e21c7c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5f8dc70697120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f91f7dde94b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_5f983ac93826e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f906ef1a21fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5f97c93364db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f87620e509e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f88c1df42af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f9a3d483ce70.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/posufij/fivozevavelexoropifonaf.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/69076581275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2f72dd-28ca-44c1-b317-eec8b0885eb1/libros_sobre_lenguaje_corporal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15147317-4561-4ca7-bc5e-3107f123cb94/41863048153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2308fcd7-44d2-4fb0-b813-f4d5a2beb341/mutual_agreement_to_arbitrate_claims_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c95878-99f7-4d47-9820-e1a9db93695c/jedogizovirilopofovon.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_off00007f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F43 5388 bytes
SHA-256: cfa89053d186ebb0394f692d83b4adbdd7669e9d6d1832760bc739be571aacf2
font_01_sfnt_off00009175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9175 10572 bytes
SHA-256: 1f4ee57febde4db2cfa3649372f45d4bf5b995d22451b1005f0ffb10e8477a6d

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