Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f6fa61d0695796…

MALICIOUS

PDF

65.9 KB Created: 2020-12-03 15:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4cd4d97a266363632888a5ee192f0acc SHA-1: 29c7576da749e34646354e7ba68075cd7d763a93 SHA-256: d3f6fa61d0695796583e7901e9f7510edd63db96a797c3851c42bc011e3babcc
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffking.ru'. The document body, though heavily obfuscated, contains text related to 'addition and subtraction for grade 1 worksheets', suggesting a lure to disguise malicious intent. The presence of numerous embedded URLs, many pointing to benign content farms, further supports a link farm or SEO poisoning tactic to mask the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/aws?utm_term=addition+and+subtraction+for+grade+1+worksheets In PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/788378.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/19351ff5-fcec-4108-b1b3-daeb8cb104d3/edwards_and_magee_technical_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a0d6b3-87aa-4881-b2d0-a48c28f3e5e0/manual_de_dibujo_arquitectonico_fran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8663b7df-0c3b-4c4d-b473-a906e52d8264/11163091503.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5489c403f5353fdb28927/t/5fc7b12f8f07963615835c0a/1606922547649/acrylic_nails_short_square_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd73956-b9f7-4b09-9dc9-d2223495f8e7/19375581614.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58f90b8467722f1f3741f/t/5fc86b50d6e0cc37e33c7a84/1606970192636/dotizuxaribopanutove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341002e8-db93-4d4e-aaf8-c48fb747adc4/podidivefawile.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc117c3a3bf4b14abaa53c7/t/5fc65e759d7936484066bdb8/1606835830693/browser_4g_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f41a3d2-8c57-472e-92c6-b32310717561/53769276150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba150777-21c5-45f0-8401-51b75b1dda2a/scientific_method_review_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f461c8fb-65d9-42c9-9c1f-a6c4f9c476f0/tefl_module_3_quiz_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ec6c8787e879896c16ae/t/5fc803ab6ac9cb6dc3509ed9/1606943661326/39099892289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b8fb2e-11ef-4fd8-b8c7-21a0227fdbe0/52080309869.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_off0000c2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 5588 bytes
SHA-256: 7c197c6c4f19dcd1ef9d5fb84ea562b000b6edc79171f8d1fce3d3218e6e2e59
font_01_sfnt_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 10804 bytes
SHA-256: 2d9e6cb249637036b905163020a27b3a61685215929838c25b6d3d643d5ae8e5

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