Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ff5280b4e638f9…

MALICIOUS

PDF

39.2 KB Created: 2020-11-02 21:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 105c6c87be78b81e39a769b9964f35d5 SHA-1: 7bf34b6fe3371a8898d02ed3c9952722de1d4a5d SHA-256: 65ff5280b4e638f95ee7ed8b8399a1636ab3bfbf3f5a79b5aeb0a27feaa1eeb6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, indicating a link farm. One of these links, 'https://ttraff.link/123?keyword=ktvq+sports+video', is identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains garbled text but includes the URL 'https://ttraff.link/123?keyword=ktvq+sports+video', suggesting it's a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ttraff.link/123?keyword=ktvq+sports+video In PDF document text
    • https://jikiwifapa.weebly.com/uploads/1/3/4/3/134338998/kifudineworaga.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/5536424.pdfIn PDF document text
    • https://fibigator.weebly.com/uploads/1/3/4/3/134313363/6a9b1956d2075df.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/147f287276ec8d.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/7a640.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/furuponusimax.pdfIn PDF document text
    • https://zepaxanodufinek.weebly.com/uploads/1/3/4/4/134455649/79952.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/1/0268/7805/0474/files/38653835383.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/39466583914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd879bb2-084e-4110-969a-1a7b574e3337/jawaxazunoxojiwibuwezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8237/9164/files/nesco_roaster_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/26394764167.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_off00005cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEC 4868 bytes
SHA-256: 30057677d57dbda26244498164012a6845ca3cc2485f474901853a9d27a5ed59
font_01_sfnt_off00006d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 10192 bytes
SHA-256: ee32b89add3c72da3c199a5492e3895960d9e53609457a86762630610f8e32d9

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