Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd91afc2e33d6059…

MALICIOUS

PDF

75.2 KB Created: 2020-11-14 20:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d4c7b8b14caca8a3eeb32e2401e1cad4 SHA-1: 176004f8dd386fd872cf863fac1711c88c3452a1 SHA-256: fd91afc2e33d60597c4375bb3d89b52cb74f72f7eb1b7470d28c9c04a726d7df
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The embedded URLs, such as 'https://cctraff.ru/strik?utm_term=new+full+hd+porn', suggest a phishing or content-luring attempt. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting.

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://cctraff.ru/strik?utm_term=new+full+hd+porn In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8c17ded6566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5f9930f502d6b.pdfIn PDF document text
    • https://jepirozo.weebly.com/uploads/1/3/4/4/134474462/25330ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fa1539fc0c14.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/tesapibebujep/the_squire_and_the_scroll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f8ca9f-d7c8-4199-bced-516f742768e8/rivifosezed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8654f7f6-6cdb-4cf7-8690-eb54b2119b87/nomipetuxidasin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d752f7db-b29f-4000-b335-928c3a76e051/kigabag.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/warframe_euphona_prime_riven_build.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/placental_bed_disorders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5f357e-9dc8-49cd-a96b-300ab20d96fd/36613019476.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/37106056692.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_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 4556 bytes
SHA-256: d1f0526af210a27df524668020d582d54e88ee9e68ddc2a7d671cb33d677c28f
font_01_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 11200 bytes
SHA-256: 07b14c7639a89a2a93a6341abece2cd596a0d90f42aff922b9debc33f7c3991d
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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