Malicious PDF — malware analysis report

Static analysis result for SHA-256 82300958a78ed9ef…

MALICIOUS

PDF

89.3 KB Created: 2020-10-30 02:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 392c35c1a42143dab8d6ae89afefc2d4 SHA-1: d81afc0d85297a6638693977575556ddd20e8355 SHA-256: 82300958a78ed9ef56df37c59fcc002ca290338d90249c18c32a5947e0d540df
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and 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 4

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?keyword=ls400+manual+conversion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8d085ba8fa7.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/1332188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f8ecc976029f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f9b3ca8b472c.pdfIn PDF document text
    • https://seboneluwisog.weebly.com/uploads/1/3/4/3/134368334/xadipiwikena.pdfIn PDF document text
    • https://ruxibero.weebly.com/uploads/1/3/4/4/134403554/valekuvimamadot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f9728fa840a3.pdfIn PDF document text
    • https://zifuxiwow.weebly.com/uploads/1/3/3/9/133997311/bemapifuje-wazafodowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f8d6194ae51c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5f9181c2279a7.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/98f6709746fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f90c85e842a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5f8b15553be5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/btec_level_3_health_and_social_care_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/mabomebemoj.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/bibiliya_ntagatifu_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 4976 bytes
SHA-256: d562d64f66973d3aaefdcedfa0b1678ea9b5a3bd8ac4d59ab184d381f5b0f062
font_01_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 12068 bytes
SHA-256: 1ee76f4f82b06e6af65bfe90315a1b1086b0300ebfcd7227190cf30bc3663522
font_02_sfnt_off00014a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A40 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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