Malicious PDF — malware analysis report

Static analysis result for SHA-256 9937450fd47cb884…

MALICIOUS

PDF

36.9 KB Created: 2020-10-02 01:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc384f37403cce3ae0a3f9e47af36579 SHA-1: 5e997039159bb2485b98be4b983f439a9ec9a5cf SHA-256: 9937450fd47cb884d3d4115e2b5e9591b4de1a432e45199d6d3d5f9b0e855106
184 Risk Score

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, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure. While no scripts were directly extracted, the nature of the embedded links and the heuristic firings suggest a malicious intent to redirect users to potentially harmful content.

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://gettraff.ru/strik?keyword=shimmering+blight+vs+bleeding+willow In PDF document text
    • http://files.publiclandingrestaurant.com/uploads/1/3/1/3/131398406/8401899.pdfIn PDF document text
    • http://xirijimux.royal-arsenal-history.com/uploads/1/3/1/6/131606490/4d28acb102f4.pdfIn PDF document text
    • http://sojuta.countrypinedesigns.com/uploads/1/3/0/9/130969418/gukosiw.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/viluroxesurupi.pdfIn PDF document text
    • https://site-1038710.mozfiles.com/files/1038710/fefixojofezafutesasodifi.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/jopolegagaxer.pdfIn PDF document text
    • https://site-1039140.mozfiles.com/files/1039140/75966160268.pdfIn PDF document text
    • https://site-1038653.mozfiles.com/files/1038653/wuvux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec23dd7f-e6fd-43f6-86e7-9b4cc461545f/pajofitabinevonetanemogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0767ff1b-c177-453e-a9ed-364cf5ca22bd/60252923605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af99d8c1-1e29-4c87-b1bb-7672e332cc25/mizavozolititovavex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd91bb98-6aaa-4bb4-8eeb-3003e210cb0b/wobujonoruvogurunijik.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_off0000523f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x523F 5424 bytes
SHA-256: f2cc3fd1776cb570b59e6f1856c8e5348676bacd415205854a910a269d10c96c
font_01_sfnt_off00006495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6495 10092 bytes
SHA-256: d2bf2f4b3dd34e5c5254cdc1fb910a45687ea9f230d71334c365c835d0f3596d

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