Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaa4778f0e986d6…

MALICIOUS

PDF

31.5 KB Created: 2020-10-30 22:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1e6c7bcaa2785ed07e52de4b32ee89ad SHA-1: 2a128dbda2fd701f17079db14b1e5ba121474dba SHA-256: ecaa4778f0e986d6d76a0335cbd5f1fc9b0c541ba490a22c044b6a0995e26835
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded document body also contains the same URL, suggesting an attempt to lure the user to a malicious site. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/123?keyword=heroic+magic+duels+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f99208432dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5f9515b54b53a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f8cf5313efa0.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/4db1cd4d-dc5d-45a8-b07c-4471f89507e1/food_chains_and_webs_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/tecnica_de_sonda_vesical.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/gowavutezubigidomugimo.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/cuadro_de_ambientes_de_aprendizaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b867d743-79d5-40ab-be1f-64c775de5715/tugavalepe.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/52722428326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abfaf6e-5939-4e3a-b81e-3ecbcd64b5a3/febitido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29aa2b93-8f66-43e7-9ade-95bb968a2fdf/55759118689.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/geometry_chapter_6_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c24a271-a88a-4d8a-8ba4-2b6a5cbf2570/pufutekiv.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_off00004153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4153 5220 bytes
SHA-256: 0abf9c4be8559ecbb4e9b44393cf95f4e909a51a4b51b397ae20e990ee58990b
font_01_sfnt_off000052f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52F3 8920 bytes
SHA-256: 090a64f5c6a27938ad38be9b49f3481cd9c59bc74b6a81ec898dd970c053b3ad