Malicious PDF — malware analysis report

Static analysis result for SHA-256 7884193739f41889…

MALICIOUS

PDF

37.3 KB Created: 2020-10-02 22:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c71d3332e20614ab643cecc8bcaef303 SHA-1: 331d0b2fc0f49e7347c8d76189c8040338cebd42 SHA-256: 7884193739f41889ee9d6f3130963e656829709d2a0dcb3da52cde801026e68a
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a known malicious redirector. The document body, though partially obfuscated, includes the URL 'https://ggtraff.ru/strik?keyword=katalog+toto+pdf+2018', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF, and heuristics indicate it functions as a link farm on disposable hosting, aiming to redirect users to malicious content.

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://ggtraff.ru/strik?keyword=katalog+toto+pdf+2018 In PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/mizukorij.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/61119133636.pdfIn PDF document text
    • https://site-1039431.mozfiles.com/files/1039431/20405154121.pdfIn PDF document text
    • https://site-1037101.mozfiles.com/files/1037101/83878481778.pdfIn PDF document text
    • http://files.eskernorth.com/uploads/1/3/0/7/130739928/xidozidotaxaf_mejonano_nisogog_mamiwazotexeg.pdfIn PDF document text
    • http://mojape.nishatrades.com/uploads/1/3/1/3/131381658/57fdb9677c.pdfIn PDF document text
    • http://mibifoba.crupropertymanagement.es/uploads/1/3/1/1/131164392/3351265.pdfIn PDF document text
    • https://site-1040427.mozfiles.com/files/1040427/kagomubetowowanefiroki.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/libazanekiviwumamaxak.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/416b2a42-1750-4643-b558-69a0fcee9ca0/velebatojawozanuwegum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed809e2-572e-4623-87b7-eda75a355102/28284185297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e00254b-4dc7-401b-9d58-3d7745081311/wuwarutex.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_off00004f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F78 5424 bytes
SHA-256: d24cd2781d76072293a5f822edafe4002a308298d39f812efb3725fcaa345c86
font_01_sfnt_off00006217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 11684 bytes
SHA-256: d3cf63a7904ad2709b52eb7e9aa7a2d58da45625b136a955e6d37603ad84015d

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