Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fe9fe0e0394adf…

MALICIOUS

PDF

47.4 KB Created: 2020-11-09 15:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d52f46e13c52784aca23dd89dc6f0c0f SHA-1: 159f4d1a1aaf151e19a7555ad6eef699787a1eb1 SHA-256: c4fe9fe0e0394adfd100098770e134de4fd6a501a78ce31d8b4196a7288b8433
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics. The presence of a link farm suggests an attempt to distribute malicious content widely.

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://traffine.ru/strik?keyword=wilder+vs+fury+reddit+streams+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5fa162c6cf7f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5f9a3555b6dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424037/normal_5f9786dd1e279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fa7609f6b33e.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/8940d7cb9837.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/0eb403315.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/xodagejizorininagas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f901a255268c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f96f1bb44afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f873eacf0694.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/3e9f44b0-0972-4ed9-87a4-79ebbfbcb471/exercice_corrig_augmentation_de_capital.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/3070726391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda26327-ae16-443e-9d1c-4ebced42bbed/kibusozi.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/47696438888.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/keto_diet_plan_india.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 5500 bytes
SHA-256: 3447aee3e2bcecb88f82a5d893c59c05994e79e6efa69dfc2cc341e3b9d775be
font_01_sfnt_off000073bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73BB 11688 bytes
SHA-256: 5d967a74492c82353e5fa42e4da44c74782365acb5cfecffa4550ba3a297c32e
font_02_sfnt_off00009b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B99 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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