Malicious PDF — malware analysis report

Static analysis result for SHA-256 26be78226223f663…

MALICIOUS

PDF

46.6 KB Created: 2020-10-11 06:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1425f70d5da27a67ac8817f0adae2a53 SHA-1: fbfcef52aa3256923600b462f4e798be54bbc92a SHA-256: 26be78226223f663e7629a86acbee1c3da334a1ab35a1e227633e17bdbaae912
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=milftoon+site+rip'. Additionally, it features a PDF link farm with numerous external PDF links, including one to 'https://uploads.strikinglycdn.com/files/d1030fda-576e-42f0-9f62-4ebd7c62a5eb/jalitabelepimuju.pdf'. The document body, though heavily obfuscated, contains these URLs, suggesting an attempt to lure users to malicious content under the guise of search results.

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://cctraff.ru/strik?keyword=milftoon+site+rip In PDF document text
    • http://files.mo-menshealth.com/uploads/1/3/0/7/130776580/letagekotaj.pdfIn PDF document text
    • https://site-1039400.mozfiles.com/files/1039400/pabis.pdfIn PDF document text
    • https://site-1037869.mozfiles.com/files/1037869/97712335065.pdfIn PDF document text
    • http://sekanepe.enlightenedhomemaker.com/uploads/1/3/1/0/131070355/6600525.pdfIn PDF document text
    • http://gusotob.goldengatecyclists.org/uploads/1/3/2/6/132696194/zewemariti-tumexajej.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/d1030fda-576e-42f0-9f62-4ebd7c62a5eb/jalitabelepimuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df36590e-4291-4329-9aa1-9516b6128279/34319844708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da265bd4-ba5a-47bd-806a-204c9cc360b9/3207589468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb035a5-b1f6-4b26-abc5-6f448d051889/takijopugoxarala.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C96 4688 bytes
SHA-256: b960a489104b2b55a6970fcc8f564ff466c84628ffd16aebc86c0dce0c21742a
font_01_sfnt_off00006ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA3 14232 bytes
SHA-256: e0e0a8506bd2b2ab4d375593c2d4a835a1b3f789daea2071e2b024d4fce25a4b
font_02_sfnt_off0000994b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x994B 16068 bytes
SHA-256: 9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6

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