Malicious PDF — malware analysis report

Static analysis result for SHA-256 8037a90a699a7a46…

MALICIOUS

PDF

42.4 KB Created: 2020-10-07 08:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 961ce1a38cca73decb29158f271ab9a3 SHA-1: ecfabc380ffbbb0fa29d0bb6412a2d1cf68cf31c SHA-256: 8037a90a699a7a46da0ffa46ff8618c3027e67def7e5f776a37e968df2541ee5
204 Risk Score

Malware Insights

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

The PDF document impersonates a cloud document lure, attempting to trick the user into clicking embedded links. These links lead to a redirector and then to a link farm hosted on disposable infrastructure, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=android+tutorial+in+hindi+pdf+download In PDF document text
    • http://files.nh-dreamhomes.com/uploads/1/3/0/9/130969385/2760890.pdfIn PDF document text
    • http://wulumo.hethwoodfoundation.com/uploads/1/3/2/3/132303382/nexopovakizaku.pdfIn PDF document text
    • http://salofibud.classicandassociates.com/uploads/1/3/1/6/131636677/66ea4f80d2.pdfIn PDF document text
    • http://files.dogsbydana.com/uploads/1/3/0/9/130969986/lerif.pdfIn PDF document text
    • http://files.well-estar.com/uploads/1/3/1/6/131637034/91a0067.pdfIn PDF document text
    • http://vodafili.garywelton.com/uploads/1/3/0/7/130739540/7490370.pdfIn PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/lizivudalaxukorudimadav.pdfIn PDF document text
    • https://site-1039804.mozfiles.com/files/1039804/54382538332.pdfIn PDF document text
    • https://site-1040284.mozfiles.com/files/1040284/88176564019.pdfIn PDF document text
    • https://site-1040561.mozfiles.com/files/1040561/45360098411.pdfIn PDF document text
    • https://site-1039222.mozfiles.com/files/1039222/bituzojanap.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/51456d75-d188-4e21-abe4-56da75058717/korobamowexokerumotataf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18439631-2e63-44e4-b075-4db9d2628c37/latetuxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abad203-becb-4d6f-9100-7bfd91126c96/bamuratitul.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_off00006932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6932 5032 bytes
SHA-256: 37c07fadebc59c91df62d5a9b1e50e9438d42615106ce4cf3b91999355f97f4c
font_01_sfnt_off00007a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 10104 bytes
SHA-256: b445d3667c4490b892931e7e2440c4dfcd3ba7e810f9feb1a882353749285fee

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