Malicious PDF — malware analysis report

Static analysis result for SHA-256 8383e7e8afca5901…

MALICIOUS

PDF

47.9 KB Created: 2020-09-30 14:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3cb0b3f6d7e71fa3e4465e93efa0ede SHA-1: 5b8284c78bc20cf93a2b5f6a7109d9505b7b43c3 SHA-256: 8383e7e8afca5901642b96005bc4bd3780e19387575ec477b8ed38557b42ac20
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are also flagged as suspicious. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=cavite+mutiny+debate+pdf In PDF document text
    • http://bejagid.diylabourpain.co.uk/uploads/1/3/2/3/132302720/e0e70.pdfIn PDF document text
    • http://files.mkmwoodkreations.com/uploads/1/3/1/8/131857758/kuwejoz.pdfIn PDF document text
    • http://files.fftaxidermy.com/uploads/1/3/0/9/130969312/9bde5b332c81.pdfIn PDF document text
    • https://site-1037037.mozfiles.com/files/1037037/63230427383.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/vupimuxituni.pdfIn PDF document text
    • https://site-1036744.mozfiles.com/files/1036744/60220623978.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/76015403402.pdfIn PDF document text
    • http://vovigog.riverglennkennels.com/uploads/1/3/1/4/131454215/nixezexirazezib.pdfIn PDF document text
    • http://files.boobsandgaming.com/uploads/1/3/0/8/130874371/pataxab-rajuruzatibis-sapefodamuvoro.pdfIn PDF document text
    • http://koriwudi.abellcable.com/uploads/1/3/2/8/132815806/4180883.pdfIn PDF document text
    • http://dobuxipak.ifindoubttravel.com/uploads/1/3/0/9/130969723/5230393.pdfIn PDF document text
    • http://files.chickadeecanvasdesigns.com/uploads/1/3/1/3/131380470/6314c3d888613.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/fa6255b4-4f35-42bd-b1c2-4610f80a7a8f/59700567302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8952469-899e-4d31-9451-4900040fd2e2/bagirajojumamap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf0f606-9b43-4c00-b129-1eb1b66ecdec/81940609150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee736769-5d79-477e-bfa8-661637d55c7d/5254381115.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_off000071a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A1 4980 bytes
SHA-256: b115b055392da33b91e1f8ff6272ea7a398a421c180f6887f246f14b54cc44fb
font_01_sfnt_off0000828b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828B 10248 bytes
SHA-256: 35af873b1d60db8742532af20d52027e57256a3c2943bd3daa8a44193bb15bd2
font_02_sfnt_off0000a4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4DB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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