Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dfde62b69065ec…

MALICIOUS

PDF

43.8 KB Created: 2020-11-02 13:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 81208eb3e4d0f0d75816b131b43549f1 SHA-1: 9ecccb981002a2ec74c277bc6540fe17226c7d3d SHA-256: 39dfde62b69065eceafa541ae625d515901f4e1e361e8f8ffdf2314bfd4944ae
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to disposable hosting services and redirect to known malicious infrastructure. The primary malicious URL identified is https://cctraff.ru/strik?keyword=a+is+for+apple+worksheet+toddlers, which is flagged as a malicious redirector. The document's content, though obfuscated, appears to be a lure for educational worksheets, likely to trick users into clicking the malicious links.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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?keyword=a+is+for+apple+worksheet+toddlers In PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/4300109.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/3787719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f909e594678b.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/lusafagakolo.pdfIn PDF document text
    • https://somanenor.weebly.com/uploads/1/3/4/4/134472611/mejaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_5f98626dd0def.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/13fc2c8b.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/wadalopeguvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f8e3cdc1abd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f914d80e5687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f8e61429e61d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f96073294026.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/40345b11-4b06-4d0e-8ca8-489fc4ea2b7f/23840786872.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3357/5075/files/32159060957.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9872/1442/files/gifipugokojonef.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_off00006b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3B 5276 bytes
SHA-256: 4b8af3df100ce600f859e80af2cdcfc3f2a0972c53d4972744931daf9123db1c
font_01_sfnt_off00007d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D36 10892 bytes
SHA-256: dc3d3816a58b02c4e066efc7d4b98dfd5ae3ac73f92a3b441f3835fb1ec91063

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