Malicious PDF — malware analysis report

Static analysis result for SHA-256 b484d2c6f0259b47…

MALICIOUS

PDF

67.3 KB Created: 2020-12-23 14:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a5e3789b45c682e42f655fca100c436f SHA-1: d53cc59d19c6cffb1114c242529fb7156eb85e4c SHA-256: b484d2c6f0259b47d54be5b3686aff9db134f9dd11ddda82839c81560ce1f124
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a malicious redirector. The primary malicious URL, 'https://cctraff.ru/123?utm_term=osrs+cook%2527s+assistant+guide', is likely used to redirect users to further malicious content. The presence of numerous links and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

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?utm_term=osrs+cook%2527s+assistant+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5f9351666185d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420610/normal_5fc46aae1fdbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467032/normal_5fc6d47c4b7c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_5fa617f784433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_5fdabcaf56bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5fb441621ed2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5f8fde05cfa64.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/vopokuxa.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1515306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_5fa74c6a2a9f4.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/1773434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_5fada04cd2db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5fbea75292bcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fc80ff51c78c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f9e00ab7794f.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/bisute/podetugimavox.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/lg_442bg_tracfone_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/50648058351.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_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 5200 bytes
SHA-256: 40ca83d119617264ef56af6fbbd89307897e7931276c9ef1bb4f995bec7ad347
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 10924 bytes
SHA-256: f7c1b9f25dded0a94e2ebb214819f3ed0731608245ccddc9805350cb31f0b778

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