Malicious PDF — malware analysis report

Static analysis result for SHA-256 21888a50bfadbaac…

MALICIOUS

PDF

69.1 KB Created: 2020-11-18 03:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8fb2fdc1d063dd6031363ce4e9a2e644 SHA-1: b5a9217b29afe6586a90d9fe012a51df59871f51 SHA-256: 21888a50bfadbaac868fa832cab7afb777a11284d850c6b6545cb06edb470813
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://ggtraff.ru/123?utm_term=light+novel+pdfs'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ggtraff.ru/123?utm_term=light+novel+pdfs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f99be4714f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f87523f91a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_5fb378aebdc45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_5fb2f586c80f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5fadaca20f957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fab177e56025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zesotat/gesuxid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24bb05c-6beb-41be-b2fb-0a5363146eaf/penajul.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/7_oceans_of_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6205604e-43e4-4d51-b05d-f59116a25f4b/91202431017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E7 4788 bytes
SHA-256: deb0edb08ef138a1616c45ce11c6628f5505d12dff7216f53d50e7a6f0a47d8b
font_01_sfnt_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 11032 bytes
SHA-256: 3ab7de2916ce7f63622398591bab717fe03c106f995a5b635ef584a71b5f9f4c
font_02_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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