Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cd2faa2fc6832c…

MALICIOUS

PDF

38.6 KB Created: 2020-10-02 05:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 577b4307bcb08eb29ea6610acab21de9 SHA-1: 7bd3e1d8612685f616280c58b537402875068e05 SHA-256: 99cd2faa2fc6832caba95169f54794ab5dfcea4150a4d4f971881b919f8eabdc
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, includes text related to downloading PDF books and references the wkhtmltopdf tool, suggesting a potential lure for users seeking specific content. The presence of many distinct hosts and links points towards a link farm or SEO manipulation tactic, likely to drive traffic to malicious infrastructure.

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://cctraff.ru/strik?keyword=descargar+libros+de+energia+eolica+pdf In PDF document text
    • https://site-1039266.mozfiles.com/files/1039266/wekuzagotusugopizudibuz.pdfIn PDF document text
    • https://site-1039852.mozfiles.com/files/1039852/kogedomupagikidutof.pdfIn PDF document text
    • https://site-1040002.mozfiles.com/files/1040002/33455734443.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/38141688699.pdfIn PDF document text
    • https://site-1039802.mozfiles.com/files/1039802/midunazaju.pdfIn PDF document text
    • https://site-1036881.mozfiles.com/files/1036881/35606460092.pdfIn PDF document text
    • https://site-1040347.mozfiles.com/files/1040347/18052142873.pdfIn PDF document text
    • https://site-1038522.mozfiles.com/files/1038522/56017749635.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/pupag.pdfIn PDF document text
    • http://files.yehudiwyner.com/uploads/1/3/0/9/130969545/3d315d757a26db.pdfIn PDF document text
    • http://files.jupitersdream.com/uploads/1/3/2/7/132740214/dipurerupa.pdfIn PDF document text
    • http://zipul.effinghamelementary.org/uploads/1/3/1/3/131383309/9d5dbbbf.pdfIn PDF document text
    • http://files.castleisland2go.com/uploads/1/3/0/7/130739122/masuzizob.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_off0000544b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x544B 5464 bytes
SHA-256: 0aac72091cbf11f214cd562815d920c774e8a758a7a1598e7af9f170f8314a41
font_01_sfnt_off000066ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EC 11340 bytes
SHA-256: 9a9e9662339c9e16bdc548f6497fbbd0eda6ee96c704e672e46a5e643e2bce4b

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