Malicious PDF — malware analysis report

Static analysis result for SHA-256 76810b3ce33ad96a…

MALICIOUS

PDF

107.8 KB Created: 2020-10-30 19:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 823bf7233602ac9e51d3e8cd8efc9cfc SHA-1: d27346b82119ee14bd876cf108a03d6baa374f11 SHA-256: 76810b3ce33ad96ab0633bbd64b483e9bd48b466faa0eb2290612064b0bf54ba
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 0.9999

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://cctraff.ru/123?keyword=bangalore+metro+status+today In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f932dbec2ccb.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/a75755.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/danowelupidisatadow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f88ed866088c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5f98899ef0991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f8e7ded4f48c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f88521d24315.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/titugome/78620457783.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/aditya_birla_group_history.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/18366473893.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/african_countries_and_their_capitals_and_currencies.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14501 5132 bytes
SHA-256: ea7374f4dceac74614516bc2a25f429332afb79fbd272110a4583cb7423072a9
font_01_sfnt_off0001565b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565B 11628 bytes
SHA-256: 892405b99aa1286b7802073536002d3c4c07829baf748c12cffbb67a5b6f0f13
font_02_sfnt_off00017e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E5F 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_03_sfnt_off00019376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19376 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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