Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b9e3e4d72f985a…

MALICIOUS

PDF

44.7 KB Created: 2020-11-01 10:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 14d3d812c2c4dcb682e6fd7a1bee7157 SHA-1: db841eab46b710db7236dbce59e77eaaec5fb8b4 SHA-256: b5b9e3e4d72f985a7c5b57f38b8fd4d924add1c166eb89573d374d2a47b90f00
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://ggtraff.ru/strik?keyword=klein+isd+board In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f9e5c8940497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5f99dc9e18022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5f954489c72b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f94e9ce94222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f99d032e8a4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5f9a560c343fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f8ebbd81993a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f924385d1542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29eed47-1775-4a02-8e36-37066aa455d0/69787961315.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/serilofafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beafe3dd-65c5-4b08-8655-41697000f264/zopaluxujuwupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea49d917-5cd0-4886-892a-a559ee08f551/rofume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442fe85d-669a-45cc-b796-1aad934ee88a/gimatazis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9760b064-466d-45a2-8fd6-bcad696ec65f/62028841099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5166e14e-8410-47b8-a7cb-95a986738f06/ponexajagalesepo.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/96696085722.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_off00007028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7028 4928 bytes
SHA-256: 478bbdad025cedfa8fc7186d0f3a5a560a01c111efe58665c72f75307c498d26
font_01_sfnt_off000080f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F4 11028 bytes
SHA-256: 47a419899b5acad5b57c172c759b6ee2400dc0bcc7cab7c534fdbaa918cb93f9

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