Malicious PDF — malware analysis report

Static analysis result for SHA-256 957d8584ad3fbcd8…

MALICIOUS

PDF

39.0 KB Created: 2020-10-07 03:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8bab2260d7581a614dbf2bac81058231 SHA-1: d58e2747874b9270a2ba93f0565310d0773d21df SHA-256: 957d8584ad3fbcd80fcf4779098c2cab4d45f9ec0677546156af014f847bb1f8
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 infrastructure, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL, 'https://cctraff.ru/strik?keyword=the+allyn+and+bacon+guide+to+peer+tutoring+pdf', is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking the malicious link.

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://cctraff.ru/strik?keyword=the+allyn+and+bacon+guide+to+peer+tutoring+pdf In PDF document text
    • http://files.aristotelisd.com/uploads/1/3/0/7/130739398/puremiziguj.pdfIn PDF document text
    • http://files.excelfitnesscenter.net/uploads/1/3/0/7/130775431/nidufibefetob-tawawix.pdfIn PDF document text
    • http://kanofuf.uniontownartclub.org/uploads/1/3/0/7/130739974/c38b0dcec15636.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/9aef047d-b670-4e9b-9754-40db2d849d82/zukazikulerugapomutevubug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be6dab2-8853-4159-ab56-b85f03789492/84550154876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c4894d-270d-4ed2-84ae-097eb115ec1d/6567559317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a84bdf-8e0d-4ced-a251-cc94f106f76d/jomaxelozobuvivukitiberi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1d5e5c-fba6-4076-80b7-cccabe954603/silibajumikabafokifa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2839/7732/files/chocolat_cell_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8be2e0d-f113-434f-9bef-c77fc664b36a/27491790198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4056282-5bbc-4544-b550-fc137053ec10/sifoxevosokojet.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_off00005952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5952 5428 bytes
SHA-256: daee5fe427670d0655f3dcd7677c4ef703f7b62db037fcadae243df02073a56c
font_01_sfnt_off00006bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC8 10256 bytes
SHA-256: 61b308c49b1ee719bd4e54a3495abacd2a836f0abccdcd791001209f2ce8e791