Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e20ec764638008…

MALICIOUS

PDF

40.6 KB Created: 2020-11-04 23:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 194d4678d541cbc58a3a62d98070dbd3 SHA-1: d5d1934c5e224da1d66c7c01ed1f3d9a2fb73953 SHA-256: e8e20ec764638008ab1b6cd1b4f1b7d0306a727439cfdfb4e9cb0b0aba3dc7b0
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, specifically `https://ggtraff.ru/strik?keyword=price+of+cachet+pure+cbd+oil`. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it is a link farm on disposable hosting, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=price+of+cachet+pure+cbd+oil In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f90f0e9302d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5f9ea56497497.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/letekigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f93ee8591a28.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/fuxivuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f9849d5264f8.pdfIn PDF document text
    • https://muneberixiloza.weebly.com/uploads/1/3/4/3/134339704/ritetatozukodako.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/33e165fce2.pdfIn PDF document text
    • https://wepoduxusuduxi.weebly.com/uploads/1/3/4/3/134306179/7961225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5f92d244c7e75.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/3166316e-bb4d-4fd9-b3ce-de76639783de/40194017340.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/northbrook_school_district_28_employment.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_off00006183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6183 5204 bytes
SHA-256: e2a92501b8faa7cb537711cdf6f63b4a27697b86f28727aac125a0faf20329c0
font_01_sfnt_off00007328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7328 10208 bytes
SHA-256: d1642c4029e0cb5defd9885d6535d282d883b5f019f55ce1f895a189c20af42b

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