Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc5564723bc7c42…

MALICIOUS

PDF

38.4 KB Created: 2020-11-04 21:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 19f226956a4081c12c41f0a546684a1a SHA-1: de4d6ddd32bb74a2d32d796db25431ce176f12ab SHA-256: 8fc5564723bc7c42cad1f02706f29a1234eaeb2fa6fd4cc03972cc5cf46a2f66
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a lure to redirect users to malicious sites for phishing or malware delivery.

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/wb?keyword=numenera%20player%20s%20guide%20pdf In PDF document text
    • https://jurosoke.weebly.com/uploads/1/3/4/5/134529251/4f886e4fc4a.pdfIn PDF document text
    • https://mupawume.weebly.com/uploads/1/3/4/3/134365579/2988250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f8b658e5e7f4.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/07b40f9.pdfIn PDF document text
    • https://japidofig.weebly.com/uploads/1/3/4/5/134503064/336a843a2c12e65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_5f92f0006474b.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/boxopibag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f9695b29211a.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/mutirexa/childish_gambino_new_album_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932a5b1c-dc54-4a96-a7c1-c25a072f8fd6/87659923709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdacc82-5934-4d69-8e86-d9bd17462129/daximujagedesoxu.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_off00005738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5738 5432 bytes
SHA-256: 9370761675e3a0a49e9db3700278dabc88422e5c06ad06fac16c0f5ffb36ad70
font_01_sfnt_off000069ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AB 10572 bytes
SHA-256: 662b417845e7f249d82835c7d0be1bebb2df1045b9f85b1594255a27876ad6d4

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