Malicious PDF — malware analysis report

Static analysis result for SHA-256 69757ed376725560…

MALICIOUS

PDF

41.5 KB Created: 2020-10-31 18:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 35d8a46c2a01f98bc7e6838a8c41a157 SHA-1: 0f4dd020e22516a023a8a6d0864f1d898b5954cf SHA-256: 69757ed3767255602e094f64a426d63ff8dd9ed617fa031fa0c2422b0ea7649e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with many pointing to external PDF files hosted on disposable domains. One link is identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be link farming or distributing malicious content via a large number of URLs.

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.com/123?keyword=takaki+a+different+mirror+summary In PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/kovisemifarigugufol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f9b8cedd032f.pdfIn PDF document text
    • https://weropejo.weebly.com/uploads/1/3/4/3/134321986/xavur.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/154e3b45d9.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/78e93a.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/108d2e1.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/6506817.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/e89fd39b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f8c7d2b0c5ea.pdfIn PDF document text
    • https://puvovajol.weebly.com/uploads/1/3/4/0/134040332/lakosusovexaw-dotodobuwe.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/1/0505/8628/8296/files/7_types_of_culture.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/89123123596.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/whirlpool_gold_accubake_system_oven_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0878/9150/files/xuwusisefuloxafo.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_off0000650e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650E 5136 bytes
SHA-256: 65a793818ad5e1005c6f5077bd94115af8d9d2acfa2a3403525fdd42875e53c0
font_01_sfnt_off0000767e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767E 10184 bytes
SHA-256: d6c9939fdb7d513112ad0b8a8affa69e4c8c6a7ccebf4f22fdb05a8fedc156fa

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