Malicious PDF — malware analysis report

Static analysis result for SHA-256 845a05d92385f663…

MALICIOUS

PDF

43.7 KB Created: 2020-11-01 02:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c2859797e77dd374501f3a691f65dd6 SHA-1: be483b30a3e1f90eee94c1b460f00e1598f6b518 SHA-256: 845a05d92385f66307d92119148530d4c58407035077a0b21e146059f6835a6c
94 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which is flagged as a malicious redirector. The document body, though partially corrupted, suggests a lure related to political voting, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing the user to malicious infrastructure via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=reasons+to+vote+for+democrats%253A+a+comprehensive+guide In PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_5f8c9eb5ad9b9.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/9e4ebd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f87cdce412c1.pdfIn PDF document text
    • https://duxujofibedusor.weebly.com/uploads/1/3/4/5/134577283/tusofireguza_rejeg_pinapogezenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6189/9171/files/37185598517.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/folotibi.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/3263427440.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_off00006a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4E 5656 bytes
SHA-256: 7f26ee48a79caafbcb232457814da28d9fd12b1df2ce207125a5737191b2fb83
font_01_sfnt_off00007d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D76 10768 bytes
SHA-256: 2647a254dfde4841ca8ffe49492890bbfc93c92ee90b2051280895943506a548

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