Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c7525cb15c6bc4…

MALICIOUS

PDF

77.7 KB Created: 2021-01-01 13:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ea76b51b390f29ae6bf6fdf0a8ab2b29 SHA-1: bce2278db835596a32bfab669e71e7fc8a7c5dd1 SHA-256: 54c7525cb15c6bc4ddec9215a5fa803ba077d6db2d87da9bb72cc85ef7e3a940
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ggtraff.ru'. This URL is likely used to redirect users to a phishing or malware distribution site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, including one to 's3.amazonaws.com/belopudevuzuza/barefoot_investor_audiobook_download.pdf', suggesting a broader campaign. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?utm_term=parent+plus+loan+rates+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fd91743550cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f9bf1689a2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_5faa6330d09eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_5fb7125299c82.pdfIn PDF document text
    • https://fetoviwenibade.weebly.com/uploads/1/3/4/7/134701039/0c05190f.pdfIn PDF document text
    • https://roluliduz.weebly.com/uploads/1/3/4/7/134771057/lagajubetinogu.pdfIn PDF document text
    • https://fajalosi.weebly.com/uploads/1/3/4/9/134901252/fefezotejuxujolez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375210/normal_5fde90e83f547.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/belopudevuzuza/barefoot_investor_audiobook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef5f4a8-8a12-4a5c-bba2-9baf74967d2f/tyler_twist_protocol.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/19746329782.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/56833655064.pdfIn PDF document text
    • https://s3.amazonaws.com/timafatafej/xogawig.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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 5332 bytes
SHA-256: b3ed95f3cbb5f877412cda28dd07f65ee28e6cb752def4d7995db8787290fba1
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 11448 bytes
SHA-256: be5c6d693b77858d45ccebf43762a9b78ef7b46b66a7ad163cf012a76327e075

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