Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef33495fcc28db6c…

MALICIOUS

PDF

75.1 KB Created: 2021-02-27 04:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: daba136922710885ac837c63167001f1 SHA-1: 71e9135095ec3d56602bfd987e54e0314eb8f5d8 SHA-256: ef33495fcc28db6c67797e6abfc98fcbd2d618af428a22a1a1463fed89dea044
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with a phishing lure for 'free tinder gold'. The ML classifier strongly indicates maliciousness, and the PDF structure itself is flagged for linking to potentially harmful sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=free+tinder+gold+july+2020 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5ff27295124d9.pdfIn PDF document text
    • http://reduslimitalia.site/amrit_maan_video_song_differencetoa2k.pdfIn PDF document text
    • http://xifasiv.getenjoyment.net/xulupoxidawigibepixete.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/where_are_american_home_sewing_machines_made.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_601d606e5c981.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/rukaj.pdfIn PDF document text
    • http://dkmz2.club/jenosoluwipidila951b3.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/jibjijf/12384884048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/petuledakebizopafanaji.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/simile_metaphor_personification_worksheet_grade_6.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/suzevuparegikezawe.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/19867137140.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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 5012 bytes
SHA-256: 4598984bcb7788917ca08fa38a66ee6ee34780956ac0f0334c2cd1caf11c1a54
font_01_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10192 bytes
SHA-256: e29c975a253a5f8cc0ed58fb0aeb24149fa1706bca57c15ae2a5224e5533e8f0

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