Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb6da2640a78cc9…

MALICIOUS

PDF

66.6 KB Created: 2020-12-18 10:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5cd382d68523419db15b03b8b4df5670 SHA-1: c311723a26bd1666fcebfaf020b832051d8b01be SHA-256: 3cb6da2640a78cc9d32b125836df3fd0368d73ab12e150e0d6f29a105defa7ed
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with critical heuristics indicating it functions as a malicious redirector and a link farm. The primary URL identified, 'https://traffine.ru/123?utm_term=gwen+stefani+4+in+the+morning+lyrics', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of numerous external PDF links points towards an attempt to direct users to a network of potentially compromised or malicious sites.

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://traffine.ru/123?utm_term=gwen+stefani+4+in+the+morning+lyrics In PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/muzab-pegixudumewojom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_5fd1d6655f547.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/2b5bc5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5fb7a1c5104bb.pdfIn PDF document text
    • https://xudaxeja.weebly.com/uploads/1/3/4/3/134339900/dd6fb48c3140952.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/0a8b3477-3ccf-44fd-b36a-16ad6d9f2cc5/66070466871.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/dire_maul_key_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a18bae4f-c13a-47a0-986f-a934978418f9/gobamud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be804ca-3a27-4857-b2f0-034477739600/lyft_marketing_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b610dad3-9771-4aac-8e75-a0b127f8e943/sepolewidixopunadamelena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3f6c14-cc16-48cb-b02e-5dd7cfbfa3e5/tom_brown_tracker_knife_movie.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_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 5608 bytes
SHA-256: efaa0e5b2715cba89ff065ad70e17c1a4852764c963f8caaf41c4dd8caec1127
font_01_sfnt_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 10204 bytes
SHA-256: ac5768367a4db9ef42f6e6c888fc6ce1c23bc169e9d054a1277944dc25615a41

Open this report in the interactive analyzer, or submit your own file for analysis.