Malicious PDF — malware analysis report

Static analysis result for SHA-256 445b9d9276acd8cd…

MALICIOUS

PDF

37.8 KB Created: 2020-10-09 06:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-12
MD5: 88a364d6d28a9474a442a5e536bce4dd SHA-1: 0359102085add7f954e62ac4ab6f7daa2c94c03d SHA-256: 445b9d9276acd8cd4e086b430efa3c9134e5ca7dbf10998c50dbb5932ac2d8b6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the link farm, suggesting a coordinated effort to distribute malicious content or manipulate search results. No scripts were extracted, and the primary malicious activity observed is the distribution of numerous links.

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://cctraff.ru/strik?keyword=housecroft+sharpe+quimica+inorganica+pdf In PDF document text
    • http://files.brookeorphanage.com/uploads/1/3/0/7/130776322/mevufo.pdfIn PDF document text
    • http://files.suzettenozick.com/uploads/1/3/0/7/130775570/4586171.pdfIn PDF document text
    • http://files.mytexanlife.com/uploads/1/3/0/8/130814611/9638290.pdfIn PDF document text
    • http://files.paramountbic.com/uploads/1/3/0/7/130776023/598e2b65d78.pdfIn PDF document text
    • http://mesutotol.daycareprovidersunlimited.com/uploads/1/3/0/9/130969742/taxixi-potefevoxuge-gudak.pdfIn PDF document text
    • http://logope.tunesontuesday.com/uploads/1/3/1/4/131454766/8535821.pdfIn PDF document text
    • http://petuxusu.homesforsaleashecounty.com/uploads/1/3/0/7/130776795/bifijuzutuzas-xalutafodaxo.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://cdn.shopify.com/s/files/1/0483/6035/8048/files/stealing_the_diamond_unblocked_gamerling.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/kepapozegiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/50684201891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0013/0465/files/lucille_ball_wuthering_heights.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2372/9318/files/32595168555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/govepekufunadinejar.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_off000049bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49BB 5508 bytes
SHA-256: 201dd16b0fb2a2d1e1cfa9257ba3853c3e491e1beb3b1fd688343d5c863b7348
font_01_sfnt_off00005c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C45 9444 bytes
SHA-256: f85fb6b52202d545ea94e5472377fc5e11f5f331cfd4aef7a0381ebf3add852e
font_02_sfnt_off00007c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C65 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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