Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6953c17cefa48f…

MALICIOUS

PDF

71.3 KB Created: 2020-12-23 17:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 09ac34c295f5419323a6d46793fd53d4 SHA-1: 9b41febb09dfb11892baafc40a5aaf93ce333e20 SHA-256: cb6953c17cefa48fbea9aace135962582038095c2b0bddc56509e669f97009f6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://gettraff.ru/strik?utm_term=world+cup+skiing+2020+cancelled`. Another heuristic identifies a PDF link farm with 22 external PDF links, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection further support its malicious nature. The primary attack pattern involves redirecting users to malicious sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=world+cup+skiing+2020+cancelled In PDF document text
    • https://cdn.sqhk.co/kefesizo/hi1wggM/worldreader_free_books.pdfIn PDF document text
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/a8165.pdfIn PDF document text
    • https://cdn.sqhk.co/lumozupa/CoHhcWf/recargar_celular_a_cuba_desde_mexico.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/pagaxudi.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/tidigudetefumof/ebay_uk_app_free_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/essays_and_aphorisms_schopenhauer.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/70296316636.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/kiwi_shoe_polish_color_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba38331f-444e-4fc2-8358-27eac704ecac/95110024655.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/wazafilugedorefezesas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327a4f4a-38fc-4426-b762-dc6565c9a2b0/free_police_siren_ringtones_for_my_phone.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_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 5592 bytes
SHA-256: ebd74345fe5f9b08dd4946e3fe70028047505887887849ee21f7eed4a62d5263
font_01_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 11584 bytes
SHA-256: 18c9184c8fbf2544f8102ce2838b31166b6f5a3d44bbf7c328db3d25ddceceea

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