Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea03c8a039e36803…

MALICIOUS

PDF

66.6 KB Created: 2020-09-30 08:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a5b77f88d0bde4121419ae3beb7740f4 SHA-1: a329c6f282b02b96fee38c1e27b1ee2fe59e2565 SHA-256: ea03c8a039e36803aef076bff9fa43681bc08b4934c25ee855247bf0e521c74f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though obfuscated, includes the URL 'https://gettraff.ru/strik?keyword=acgih+2017+pdf', suggesting a lure to external malicious content. The presence of multiple links to external PDF files, some of which are benign, indicates a link farm strategy to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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=acgih+2017+pdf In PDF document text
    • http://files.kekaiart.com/uploads/1/3/1/4/131437552/50d2c156c.pdfIn PDF document text
    • http://files.wealthynationinstitute.com/uploads/1/3/0/8/130874678/ramifunujubibamase.pdfIn PDF document text
    • http://bopedok.makemeupga.com/uploads/1/3/1/3/131398244/d44cc76d6df816c.pdfIn PDF document text
    • http://suxug.writerspouch.com/uploads/1/3/1/3/131398455/dexefonugisiw.pdfIn PDF document text
    • http://files.sanctuary-magazine.com/uploads/1/3/1/0/131070131/e24bfe2c.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/c0adfb29-caad-4dcc-a802-7a859c224ac9/15792272558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661a8fda-ae3e-42e1-8bdc-3a5d9d4809ff/37002658111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4792d2b-57d3-40a9-8dce-88f81767cc23/4212553352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277d9e0d-9c85-4982-b447-4af9c9f8c919/361385971.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_off0000bde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE3 5296 bytes
SHA-256: 38a6cb15e77289d4144257653ddf14e83f149dd44581a37a8fd4bb4cf4dbd93c
font_01_sfnt_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 14892 bytes
SHA-256: c073a70ca33ff7c99077faae6e6dc0957e1a9dac01dec4fcf99ad54bb410b52e