Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6ffe49c218aaa7…

MALICIOUS

PDF

34.7 KB Created: 2020-10-06 11:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fae7ff6d5de6238a203a3e9ee841d3bd SHA-1: b8c36e9ce4949e8e75c87f09108bccee37a3bcb7 SHA-256: 2d6ffe49c218aaa7c595f6562725c1ccb5700ef4b50d218f1094973aa316d126
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable hosting domains and a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to lead users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to distribute further malware or phish for credentials.

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=glencoe+geometry+skills+practice+workbook+answers In PDF document text
    • http://files.amandatsam.net/uploads/1/3/1/4/131438538/bujinik-tafapisiwizeba-xefidoxeni.pdfIn PDF document text
    • http://files.sbeghen.net/uploads/1/3/0/8/130813135/eaed80.pdfIn PDF document text
    • http://tokeda.yes-to-adventure.com/uploads/1/3/0/9/130969060/3596874.pdfIn PDF document text
    • http://files.auchengraychurchcentre.org/uploads/1/3/1/3/131380052/zukoguko.pdfIn PDF document text
    • http://files.vasyldesign.com/uploads/1/3/1/4/131454262/a255fe89.pdfIn PDF document text
    • https://site-1036692.mozfiles.com/files/1036692/97613234321.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/gokisidezenefoxuwenip.pdfIn PDF document text
    • https://site-1038494.mozfiles.com/files/1038494/40486018.pdfIn PDF document text
    • http://files.lovemooch.com/uploads/1/3/0/8/130814297/sinukemad_ruposikedo.pdfIn PDF document text
    • http://werone.serpentbird.com/uploads/1/3/1/8/131856772/ac9d9cfc6c0.pdfIn PDF document text
    • https://site-1037120.mozfiles.com/files/1037120/70358925658.pdfIn PDF document text
    • https://site-1040238.mozfiles.com/files/1040238/lijunilejajemi.pdfIn PDF document text
    • https://site-1037856.mozfiles.com/files/1037856/posulemow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00004734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4734 5684 bytes
SHA-256: 93e0508c36c2e42eaf8da0dc09f762b9e09bf24e077bb682f0e25c85d9214893
font_01_sfnt_off00005a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9A 10356 bytes
SHA-256: 2c31cc8ed6b97a57509eab40f7ac86feac53ca480cae3c60cbf2bac006f2d627

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