Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fd08da80de0bb3…

MALICIOUS

PDF

66.9 KB Created: 2020-11-18 18:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: edc59b43a4c8fd25ef7a85c459775097 SHA-1: 277a97b9123efed319d3e77a82bf85004b067c9e SHA-256: f8fd08da80de0bb3c9792c83177ae9754854efc446e37d8ca678969a28654a68
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://traffine.ru/123?utm_term=mo+creatures+horse+breeding+chart+1.12.2'. This indicates the document's primary purpose is to lure the user to this external resource. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://traffine.ru/123?utm_term=mo+creatures+horse+breeding+chart+1.12.2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f918eb70ae34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5fa11f46e1e6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_5fa5ac249fd96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87441a869fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5f9381a695cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fa7a2c06188b.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/3b5baa6e-ebc5-4496-becc-eeb80b80f2d3/gamezux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f7de56-898e-4294-8678-b0ecc04d36c8/torewevekepabobuliru.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_off0000c89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 5528 bytes
SHA-256: c0eedac851ce2a3a9c1f9d213047c3f34af58edd5e28b1b71e3b67c3364ea089
font_01_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 10400 bytes
SHA-256: 93735ab851f7a3c1696f347715da491245a795d9796b0d013814612ecba55b09