Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b88b9b26bbb9dcb…

MALICIOUS

PDF

40.1 KB Created: 2020-11-04 21:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 00f0fe2fac566aaf1f402a3149d92576 SHA-1: a6d799ed83016217d8170caaaabc1c694af76f23 SHA-256: 4b88b9b26bbb9dcb4e7693a0dd5e674afd72baf9ea23ab360cd719526a1d3ae4
94 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified as https://ggtraff.ru/aws?keyword=stretching+anatomy+3rd+edition+pdf. This heuristic, combined with the ML classifier's high confidence, strongly suggests malicious intent. The document body, though heavily obfuscated, also contains this URL, indicating it is the primary lure. The embedded link action in the PDF also points to this malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://ggtraff.ru/aws?keyword=stretching+anatomy+3rd+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_5f9d75b1d0c12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f8cadbcaa4d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5f90166bb294d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f8e607fb0a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_5fa21f38ba1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f96de87bd0b7.pdfIn PDF document text
    • https://sedidumorasu.weebly.com/uploads/1/3/4/5/134507492/zekoguluxozadimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f924568aadee.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/fosagobomap/chevy_lug_pattern_camaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0030/6111/files/facebook_lite_apk_for_android_4.2.2.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/wajah_bandoeng_tempo_doeloe.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/7566540712.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_off00005d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D80 5728 bytes
SHA-256: 0d5f354983477ded249a838f00362c2c84b7cc1011d3d34161a7882edc4adb29
font_01_sfnt_off000070e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E2 10064 bytes
SHA-256: 63aa807b18de69e8a6cf476420d9f6e2bb7ff0c47cb19353325e13f7c7ecc768