Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65d81c59154ef4b…

MALICIOUS

PDF

46.2 KB Created: 2020-10-10 00:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8a7d2330e1747c509f6529d532d12e2a SHA-1: 782399a11c8b98690e1ddca96346ae191d51ca09 SHA-256: e65d81c59154ef4bc28ace513652adf3ae6d332a4fe4fa9baa8d2f109b479be4
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to known malicious infrastructure. The primary malicious URL identified is https://cctraff.ru/strik?keyword=woodbury+grammar+school+janitor, which is flagged as a redirector. The document body, though heavily obfuscated, contains references to this malicious URL, suggesting the intent is to redirect the user to a malicious site, likely for phishing or malware distribution.

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=woodbury+grammar+school+janitor In PDF document text
    • http://tutar.inclusive-arts.com/uploads/1/3/1/0/131069987/3027514.pdfIn PDF document text
    • http://files.zydagobrave.com/uploads/1/3/1/4/131406621/minuwininevoton-fanad-sixaduxununaduk.pdfIn PDF document text
    • http://files.campaignforcloth.com/uploads/1/3/0/7/130775907/3595668.pdfIn PDF document text
    • https://site-1039757.mozfiles.com/files/1039757/19698812917.pdfIn PDF document text
    • https://site-1041486.mozfiles.com/files/1041486/tekuwu.pdfIn PDF document text
    • https://site-1038806.mozfiles.com/files/1038806/19259966215.pdfIn PDF document text
    • https://site-1039297.mozfiles.com/files/1039297/87641519160.pdfIn PDF document text
    • https://site-1043371.mozfiles.com/files/1043371/ledanetivawom.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/1/0435/0532/0088/files/planets_smallest_to_largest.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8440/7199/files/sd_maid_pro_apk_latest_version_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e5c39e-ffc1-4994-a26c-ab93c9ee9b57/pawuselapufitekenor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6862dd34-c48d-4e89-9ec2-0fbce253f6d4/82318597134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839c9dc5-8852-41be-b7d0-7735d82e4dda/81658058609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b75ae856-0528-404b-9351-8fd44e140162/88365452082.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_off0000751a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x751A 5684 bytes
SHA-256: f0a9948a97e190818b2fb468c9ccd05b3e27a03f17b4a694a863578db5ef4a50
font_01_sfnt_off0000885b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x885B 10436 bytes
SHA-256: bec22fe7d962caeedf4b6c1690c7771c35129f59ef842be746a406904d25a7da

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