Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc49e82ebcebb53c…

MALICIOUS

PDF

32.7 KB Created: 2020-11-08 14:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 82cb0f86d4e43f2123f3cddaf8e8ee92 SHA-1: b7ab376f501adcf6a1dcc63e0681c2c39f67717c SHA-256: dc49e82ebcebb53c992ae780b07af164c4e21d88260b433c90cdc8d1006e3bec
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common technique for phishing and malware distribution. The embedded URL is designed to lure users by appearing to offer instructions for a popular toy, but it leads to a malicious domain. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=ev3+robot+building+instructions+puppy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f91a7c0e5e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_5f9186260a8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f873dce553a3.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/b4976f85-7388-4ce6-8846-c3c9cd12400c/gujonigisixejefodabolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d472e4-05d3-4eca-8d50-6a05054db984/13830012217.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/auditing_principles_and_techniques_s._k._basu_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/rewigaruki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b080dcc1-9897-4753-a674-e48f3375cb1c/98420330686.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/vijuwuxedoza.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/2060955370.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_off00003fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FD4 5452 bytes
SHA-256: 825589e2a54ee0cfc0102e57405a967ae231e275f4f99e31b3727a2cec93016e
font_01_sfnt_off0000527d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x527D 10560 bytes
SHA-256: 63144dac2d80b2fd75623cf596886b9e955b3d90db615f75e9f4ef9b4f783243

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