Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f335adc98398ab9…

MALICIOUS

PDF

65.5 KB Created: 2020-12-22 21:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 77725c9356a574aac5c0034889bb9689 SHA-1: 7e5f7f5e993e0e984fcb9a1933629be51d10b0e4 SHA-256: 8f335adc98398ab978fcf47ec2423f7bfbba5eb34838e512d7c32426fb32a112
96 Risk Score

Malware Insights

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

This PDF file contains numerous external links, a common tactic for SEO spam or phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://traffnew.ru/strik?utm_term=video+downloader+for+tiktok+no+watermark+apk'. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the ML detection suggest a malicious intent, likely to redirect users to a malicious site or download unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=video+downloader+for+tiktok+no+watermark+apk PDF link annotation
    • https://zifizegesug.weebly.com/uploads/1/3/4/7/134719454/kolab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f8b9ede90d55.pdfIn PDF document text
    • https://bopatixenokukab.weebly.com/uploads/1/3/4/8/134873261/banunuvitasemaxila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/55262867593.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/negejisavomexemagesol.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/girl_guides_ontario_safe_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/axolotl_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/bridal_shower_planning_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1853ba13a450babf87a01/t/5fccf44bc836a917f90e4e42/1607267404383/43608443959.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_off0000c4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AE 5128 bytes
SHA-256: 0055968871c6887e97f3b6ba893176d4dddadbc6b994c6c299a8733caf0860ab
font_01_sfnt_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 10188 bytes
SHA-256: ff75e29bc3845c5a1915848049007d05f72b3ce6d1b8e207d5c4157aa34e02f3