Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a8df785d832165…

MALICIOUS

PDF

40.9 KB Created: 2020-10-02 18:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 50b0841c95c049d0c758d6a94243b35e SHA-1: 07d1dc433f3ad0685b5bd367126ddf6f3cc0dfc2 SHA-256: 35a8df785d832165553840878e3e45b0b1c39e72e0a97d7a2476891a67f96937
154 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many of which point to external PDF files, indicating it is part of an SEO link farm. One prominent URL, 'https://ggtraff.ru/strik?keyword=biblia+pozna%25C5%2584ska+pdf+chomikuj', is flagged as a malicious redirector, suggesting the document's primary purpose is to direct users to malicious infrastructure. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a malicious intent to lure users.

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 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://ggtraff.ru/strik?keyword=biblia+pozna%25C5%2584ska+pdf+chomikuj In PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/27558767206.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/7606251241.pdfIn PDF document text
    • https://site-1037000.mozfiles.com/files/1037000/vaxitesomisaxeme.pdfIn PDF document text
    • http://gosetuw.localsonlychattanooga.com/uploads/1/3/2/3/132303382/reroxidesa_saboned.pdfIn PDF document text
    • http://files.lifelovesco.com/uploads/1/3/0/7/130775539/tidirezezerabiwenon.pdfIn PDF document text
    • http://files.adamfranklinblues.com/uploads/1/3/1/3/131398333/8887239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/80ab41e8-b810-4ce8-b622-94ad66d92df9/92243382385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f938f011-a8fd-4dd1-900c-9e3220fc9cc2/66147972476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ddf103-b931-48e4-86fc-89258bc867da/niliwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231486b9-001c-4e0c-ada4-4abb5636b269/16969964568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7307a56f-d0a0-4e3e-a075-f44e7ad74f53/17458306367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b10abc-0069-4555-965a-036202d544b3/96982072171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3601a94-facf-4c29-bf8c-6577cdc013f8/zadutupidemigojiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7eb233-9884-4acc-bc21-3e12306d66fe/40337749921.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51D1 5488 bytes
SHA-256: bfcbe45ad459217f0a117a97fa335e7f91bec7c51f9125393ad5f8fb4a22be07
font_01_sfnt_off00006407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6407 10920 bytes
SHA-256: e951d05a66384cf1df40ca6a1090b7e98582f6a074018a5be74a5e0c59e9d782
font_02_sfnt_off000086de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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