Malicious PDF — malware analysis report

Static analysis result for SHA-256 3942935d9492c67d…

MALICIOUS

PDF

67.5 KB Created: 2020-12-14 04:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 451a21a62d3bb7f4af9c45335c5d34d1 SHA-1: 1ed6870cfad9183cb6da94109bae07e4fe0d90d9 SHA-256: 3942935d9492c67dfb1d463602eefb527706ef60e898d6317423b347e6bdd1c2
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially harmful sites. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffking.ru/aws?utm_term=inference+worksheets+8th+grade In PDF document text
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/4bba59e74b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5fc7e73f1d194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f8ffb6acbd63.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/susopuzupure/porurofilirisa.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/gejet.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/beach_buggy_racing_2_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/jvvnl_junior_accountant_syllabus_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c3d140f1034a5caf136a/t/5fc3b8f57acac6192a31f4bf/1606662389873/84982115532.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/vyapam_calendar_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/battle_beast_bringer_of_pain_album.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/87343395070.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/ucp_of_central_florida_pine_hills.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc518149698b02c7f3bb327/t/5fcce7c7662d5e24e0a25f70/1607264199969/sniper_strike_special_ops_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/bowaboku.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/kailasapuram_murali_rowdy_sheeter.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_off0000cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 5536 bytes
SHA-256: 3f572db79ddcaa5a00440452b977347076e353e99d0b5f18bf9fbc967e04f4a7
font_01_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 9940 bytes
SHA-256: 51126987516ed5f6335657731e90e9cef9ac1b6dfff6cc19a648c97352bafee8

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