Malicious PDF — malware analysis report

Static analysis result for SHA-256 586e83cb47673f76…

MALICIOUS

PDF

39.2 KB Created: 2020-11-01 12:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cf4b80ae1254a981a06bc04bbda3b2b SHA-1: 7b19c1dcc74bccecbbcdedd06e8017fde079a21f SHA-256: 586e83cb47673f768859012f20d13ff2252d56b90552c0ac10dbb7be3a193a60
94 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF as malicious with high confidence. The embedded URL is likely intended to lead the user to a phishing page or a download site for further malicious payloads.

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.cc/123?keyword=vocabulary+workshop+level+b+unit+6+answers
    • https://cdn-cms.f-static.net/uploads/4407804/normal_5f944aa623741.pdf
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5f9c2e03a1c2b.pdf
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f99c44e63289.pdf
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f8724ff3bfc8.pdf
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5f9d348fa1a61.pdf
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f95e576741d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7403/4600/files/vedop.pdf
    • https://s3.amazonaws.com/purixifusipelid/worovarozebotusipe.pdf
    • https://cdn.shopify.com/s/files/1/0501/6233/5919/files/25191944772.pdf
    • https://uploads.strikinglycdn.com/files/b5f4c6b3-108e-4006-8a18-7cef642a3f8e/puligekirogabanagelobor.pdf
    • https://cdn.shopify.com/s/files/1/0499/9652/9824/files/dark_souls_3_best_dex_faith_weapons.pdf
    • https://s3.amazonaws.com/jasadavebaga/plot_diagram_quiz.pdf
    • https://uploads.strikinglycdn.com/files/3fa27c92-7da1-407e-b4b6-d47f38ee44c9/93540935071.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057d3.bin
0bba885e93cfac5ab00311b1d56a2a9ead227714df1decd4e90e1ab25bdd1c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D3 5596 bytes
font_01_sfnt_off00006af5.bin
6feca0798ad57edc174b2dd0635b07dda9c0fcb460c72c71b2f3e41eb9222813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF5 10800 bytes

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