Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef735592cbebbedd…

MALICIOUS

PDF

34.7 KB Created: 2020-11-01 11:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3f6f4525ddb018b30a37a7a8f4e9f0a3 SHA-1: deed63ef5197b5186a7762b4d0da6f040ab17eca SHA-256: ef735592cbebbedd0cb9041659cbb40823284ee239ad2ebeb3120e6446ad91ad
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.link/123?keyword=damien+davis+md+nj In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f93504019d2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6622/6371/files/xarisuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37a3742-f72d-446b-9aa7-8560ecfa5b15/latekagopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b12bb73-d1a6-4d74-8b5d-e4c13f2c93d8/37424780030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738115bc-eb8a-4ccc-b491-e75d48bb2ecb/fibifopale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec235430-3e0f-4346-b480-bb29ca384242/363418924.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/45841003136.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/21339377866.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/most_common_synonyms_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/sozelel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/behavioral_analysis_unit.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_off000049a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49A4 4980 bytes
SHA-256: e36018190f286c3a9f2a30004cb568007d1875ac4b56e0b276c7c36d4bd01f95
font_01_sfnt_off00005a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A94 11148 bytes
SHA-256: a33eb77d44fbcf8f64a9fcc52e74dea344bfa8d81d7b568bfe3ca04ccf4c1743

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