Malicious PDF — malware analysis report

Static analysis result for SHA-256 427995a4a7da5a34…

MALICIOUS

PDF

68.6 KB Created: 2020-11-17 02:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 31d8dd5dde80a0cac867f85219a7a906 SHA-1: 8387cf445591e7a859f282f93d1513b4f403831f SHA-256: 427995a4a7da5a348f6dd5970844d3d3c163b3d67213e4d191a02025f0425f7c
154 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 'https://cctraff.ru/strik?utm_term=el+plan+espiritual+de+aztlan'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=el+plan+espiritual+de+aztlan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5fb2998eece37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5f8b6a78896bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f95a91e8923d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_5f951ca029a0e.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/03acae90-ce98-4214-9b52-6cb9f3f63076/yellow_submarine_piano_sheet_music_m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cf393d-f044-4478-bd25-c490a00bc38e/wiwidowapilugepufesotatir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11e05cd-dc3c-4e31-9a95-055f77d5766b/94540433268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803286f9-76ef-47b8-b0a2-314317490d1c/xufevotafanafexivalomex.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/les_panafricanistes.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/mistys_tears_original.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/kafumoginizaramap.pdfIn PDF document text
    • https://s3.amazonaws.com/pojojagajevuxa/all_county_band_florida.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_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 4960 bytes
SHA-256: 6771732ffeb616a0af39d3ad1c94bf7e43505d6b2f243e2deff28fc16c6f651e
font_01_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10608 bytes
SHA-256: 5c4c684b97f6d2c759e2ba9eb6283131bbb32bb9942373e7775298ba79544e1c

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