Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc738378a924da8…

MALICIOUS

PDF

39.7 KB Created: 2020-10-31 08:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54057d4c7dbc82594985f9a5778fe109 SHA-1: 1eed9f833838a092da7f5c77a42814272e433de1 SHA-256: 4bc738378a924da8882b1b8f0ab9e27ab095fff19dc8639dcbf67fe9ff4fe65d
94 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/123?keyword=essential+idioms+in+english+book+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a phishing or redirection attempt. 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.cc/123?keyword=essential+idioms+in+english+book+pdf
    • https://mexugagerow.weebly.com/uploads/1/3/4/4/134482965/242df8.pdf
    • https://lituveso.weebly.com/uploads/1/3/4/3/134362288/4803409.pdf
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f98d2d4e5723.pdf
    • https://cdn-cms.f-static.net/uploads/4389352/normal_5f8e4401c658b.pdf
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f93d60ddbcbe.pdf
    • https://sukowaletudevux.weebly.com/uploads/1/3/0/8/130874669/gonazesajak-nawizujega-vetugun-litonasifefak.pdf
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/zawazitoxiwibusak.pdf
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/tijator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6ff05bca-757e-48d9-a6c3-cdd69d54db8a/xofopu.pdf
    • https://uploads.strikinglycdn.com/files/3f6b7092-9983-441a-9fff-bee833b69bb0/83107175218.pdf
    • https://uploads.strikinglycdn.com/files/7c2186aa-83ef-4e24-abb9-5b1040c6a6dd/87296568867.pdf
    • https://s3.amazonaws.com/kavalukato/binup.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_off00005cd2.bin
199604c94e815f8a45b6f9fb639b880bd35b630c7764487e2a52aee82254ef81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD2 5520 bytes
font_01_sfnt_off00006f6e.bin
ee70cb4812e64c620d617df9fd6115330ab5671b4c2a2cf2ef2ab6e588bf0837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6E 10620 bytes

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