Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16fd0a028f8fe43…

MALICIOUS

PDF

54.2 KB Created: 2020-11-05 22:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9949764d5cb547241d198b543d70c583 SHA-1: 11d84215038c5b4172cbf544a70562ab6d7f7d61 SHA-256: f16fd0a028f8fe43e68a4522095028df2f09ade4aa13326c0105fc97576c4d61
94 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a known malicious domain, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files, suggesting a lure to download further malicious content.

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://ggtraff.ru/aws?keyword=the+gnu+c+library+reference+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f87d60c4feac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459630/normal_5fa21a4a1f4b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f995daa2ca19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f9bd7596cdee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_5f8e3de64964e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f9216733aa0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f9bd45fd701b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f89cd0c02bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f8a2e6ae1c4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5f95c75a0a6cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4026978f-52d4-43ea-b72f-dff358df4f0b/famosas_pinturas_de_frida_kahlo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476f2cb6-31ee-4c08-bec5-d5c24a519639/de_noche_y_dia_enrique_iglesias_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbf6e14-a652-4fb2-8ae0-5801ea3ff33e/dezuretuvasawedutevegeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe90885-2619-4d53-b2d6-62512204d4ef/betemujirusaxedufideribob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85be51c-651a-4468-9768-87c2c1e5330b/31909894596.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8524 5272 bytes
SHA-256: 3a38750fdccebcce15dfcabeaee5371bdb06fd0556425283c32e7a1ca54c9d27
font_01_sfnt_off000096dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96DD 11680 bytes
SHA-256: e24ab9b292c34fc94583606d57f1972981cd7160cbb95693220bb49efe7e54b4
font_02_sfnt_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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