Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fc75b1c8044580…

MALICIOUS

PDF

67.9 KB Created: 2020-11-10 19:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6d1bd5e3097aad86b92d17547c869b9b SHA-1: a401791da559e4aa126cdbb905dce1de0cc3b117 SHA-256: 24fc75b1c80445804245f1404912a224685a40ba12cd0aa36e67348e45a17af9
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and part of a link farm. It contains numerous embedded URLs, including a critical one pointing to known malicious infrastructure at 'https://cctraff.ru/123?keyword=desolation+rpg+pdf'. The presence of many external PDF links suggests an attempt to distribute further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=desolation+rpg+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f960ce355439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_5f9c654328666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_5fa6c41594219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5f9f0466df916.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/tebasalogezis.pdfIn PDF document text
    • https://wudemivezetuf.weebly.com/uploads/1/3/4/3/134318680/2b5e74960.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/3268339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5f98c2cad5a12.pdfIn PDF document text
    • https://xixivejeb.weebly.com/uploads/1/3/4/6/134603549/934147133f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f99ae14e8310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f9c6ab724fba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/english_speaking_in_hindi_file.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_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 5208 bytes
SHA-256: 08deac3ddea2eefc388bcda38972dbe6bea851f3c0d0fa65616c4c56cec18860
font_01_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 10988 bytes
SHA-256: 6e3d2c040639fc952a31aa1dacddea174a434a2a97f8f94ea87d206caf3d33bd

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