Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c703cac3d47090…

MALICIOUS

PDF

44.5 KB Created: 2020-10-02 09:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17e7433089ab186464c739fc2fd12514 SHA-1: 3de8e00b58e7d5ad8b933a071dc54d556aa41ec1 SHA-256: 84c703cac3d47090bacc95f42fded032967b9f6fc25c4352ee4635506eac10c2
184 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Everfi module 7 insurance and taxes quiz answers' and embeds a large number of links. Several heuristics indicate this is a malicious redirector and a link farm, with one URL pointing to known malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to lead users to harmful content or malware downloads.

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/pify?keyword=everfi+module+7+insurance+and+taxes+quiz+answers In PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/komemodibomowapo.pdfIn PDF document text
    • https://site-1041761.mozfiles.com/files/1041761/newuxijifemi.pdfIn PDF document text
    • https://site-1039815.mozfiles.com/files/1039815/89066293090.pdfIn PDF document text
    • http://files.vox.vet/uploads/1/3/0/7/130776483/purojawoduwevede.pdfIn PDF document text
    • http://files.juniorleaguemcallen.org/uploads/1/3/1/4/131406864/6840092.pdfIn PDF document text
    • http://pozasab.heartmattersproject.org/uploads/1/3/2/7/132741508/bosoloxeragolelorix.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/nijolobolafebavebasanik.pdfIn PDF document text
    • https://site-1036862.mozfiles.com/files/1036862/1566644907.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/pudadaxepasiwuwiropo.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/b25ae05c-469f-4535-9fc0-26073746cee6/168061233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc88094-d471-482c-9466-a4a0847f1e0f/78737120720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e85262-d0aa-49c8-8dec-dfd24d9aae1e/velagunebopuvazagukoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aeef096-76f3-4605-89a8-6785a0754d44/45466252827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990265ef-36ba-4f4f-8058-c92cab5c9c1c/50663166754.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_off00006eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB5 5600 bytes
SHA-256: 3562dd3b06a3779b0bdf21217a2d2a22e19d857151bd608864653fc4d7ee7a81
font_01_sfnt_off000081cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81CF 10288 bytes
SHA-256: ce9de2709ade7df2a98fbe85736e105585245dd582ac4968f9f221b0524465c3

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