Malicious PDF — malware analysis report

Static analysis result for SHA-256 0033b7612a55e178…

MALICIOUS

PDF

88.0 KB Created: 2020-10-28 22:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f550bd161fab684b442bd58eb0808155 SHA-1: 23165b99602cb3d13cbeb886dba3308d6dff709d SHA-256: 0033b7612a55e178d303cef745e8d59eeca30b55b34e43719327c0adcd29d8d4
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/strik?keyword=humans+in+the+biosphere+worksheet, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of multiple links to disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

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=humans+in+the+biosphere+worksheet In PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/326f30d54c2.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/pigisilokugigu.pdfIn PDF document text
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/nekovedukimigo-wapedete.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/632ca5f1.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/34149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5f89e84a52b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f89c44b789db.pdfIn PDF document text
    • https://lopinelu.weebly.com/uploads/1/3/4/3/134369173/8881572.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/e2002ee9244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_5f972f9c0dd88.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/rozebofukixus/psc_english_grammar_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5060105a-0363-4b13-9c5a-d1010015b39e/beginning_algebra_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe36cb75-186d-4380-aa64-8faff22f66aa/26731067130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4a6435-c625-48d3-965f-35435762c199/61342032896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd3f501-1709-4bf7-9606-bd5a78288ca2/ligewajinovatoxakide.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_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 5284 bytes
SHA-256: d3cbc29288e31716a710764f928bd2b3772aafcb7237ba6dc2f9529ae9efb90c
font_01_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 10112 bytes
SHA-256: a51e6f191a383b71e73a397f82d3d2b467add6a27a5076e7ebc2073d2f508aff

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