Malicious PDF — malware analysis report

Static analysis result for SHA-256 726528fb8aa93aad…

MALICIOUS

PDF

66.4 KB Created: 2020-12-05 07:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cc064d431f6883261aef5eae68906f17 SHA-1: dd90b7297c312b75acd7a55bda67f70c53fd97c1 SHA-256: 726528fb8aa93aad65995cd574453860ad8348d1427c75e50a8f926b1e27bde7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://cctraff.ru/strik?utm_term=is-230.d+test+answers, which is likely used to redirect users to further malicious content or exploit kits.

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/strik?utm_term=is-230.d+test+answers In PDF document text
    • https://sorefikope.weebly.com/uploads/1/3/4/6/134664591/c7ca2f2a9f1ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5fc03327865aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f95f4b463fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5fb342fcabe16.pdfIn PDF document text
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/e75cfa7.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/b30c407f-b48b-4b12-b7b6-d19c07f70e6f/vusufiduruked.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3205912facd59cebb7138/t/5fc5b8f2eaf37e3b646256ab/1606793459107/6712881850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bc6796-0bf9-4310-9070-fba42fce1425/74532471039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5058149f-5cbc-451f-978a-992c6c7257f3/6ix9ine_fefe_mp3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/57279023318.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/91186445163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c9568d-3c9c-4c9a-958c-80ddb316104d/terraria_lost_girl_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/84986594063.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/mac_os_high_sierra_10._13._4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c0152c-fc5e-461e-a8ed-0e46c986f41d/ribul.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_off0000c555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC555 5320 bytes
SHA-256: 73c7de93572ad573d073a36ca351dbd0ae163dc214e8bb5d13a6b6a19f282a70
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 10796 bytes
SHA-256: f646b93628dd94b3e947b3801480455d13b8e1b34f667597b5b2a356ed768401

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