Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae520a8067353016…

MALICIOUS

PDF

34.0 KB Created: 2020-10-08 13:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5b291c990b7a5ee07289ac8e7d8dbbf1 SHA-1: 742c41f3a49074e932cdfddd1102c29448a1eafc SHA-256: ae520a80673530160005eeabfc827fc3269c2ecf66df26bd70a460b55e58d3ee
124 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, with a primary link identified as a malicious redirector. The document body, though heavily obfuscated, contains text and URLs consistent with a lure to download further malicious content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=principios+de+genetica+gardner+pdf+d In PDF document text
    • http://joban.thinkingwithcrystal.com/uploads/1/3/0/7/130775350/cbca06f0ef3917.pdfIn PDF document text
    • http://files.the-urbexperience.com/uploads/1/3/1/6/131606289/5018571.pdfIn PDF document text
    • http://files.licfonline.com/uploads/1/3/1/1/131164202/farej.pdfIn PDF document text
    • http://files.lightonwatertcm.com/uploads/1/3/0/9/130969204/34a05a8.pdfIn PDF document text
    • http://files.paintingsbychrislwilliams.com/uploads/1/3/1/4/131407812/d716b.pdfIn PDF document text
    • https://site-1036918.mozfiles.com/files/1036918/xotifibefudulokutexuwun.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/16551805946.pdfIn PDF document text
    • https://site-1038709.mozfiles.com/files/1038709/gefituvamugiziladi.pdfIn PDF document text
    • https://site-1038985.mozfiles.com/files/1038985/97802294403.pdfIn PDF document text
    • https://site-1043562.mozfiles.com/files/1043562/fewogomaxogi.pdfIn PDF document text
    • https://site-1038863.mozfiles.com/files/1038863/59280149661.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/9348488203.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/1/0491/8417/8342/files/gowevulifozekulejodivadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6091/2537/files/medical_office_policy_and_procedure_manual_examples.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_off00004553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4553 5292 bytes
SHA-256: 3d38a4e43647e34a4cf1c8890bcc3fa8bfda8b6766d78c6ed9b4b888df78996b
font_01_sfnt_off00005763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5763 10420 bytes
SHA-256: 2e17281826da77ca22b90a8a8ee8011b8787fd8ed727578e27b763323fb0fc17

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