Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc72b8a1f132e94…

MALICIOUS

PDF

47.5 KB Created: 2020-10-04 08:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e54bf9e09d4fc7778deca8c7ae0898be SHA-1: 2046da288869b218062645aebb3538fcc7cf061a SHA-256: 9bc72b8a1f132e944db40ee2a2dc42757eae7e7a5203432cf678e34f33ada8c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary malicious URL identified is https://cctraff.ru/strik?keyword=bts+epiphany+piano+sheet, which is likely used to direct users to further malicious content or phishing sites. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious files.

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=bts+epiphany+piano+sheet In PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/wabogotifovigu.pdfIn PDF document text
    • http://files.whd147.org/uploads/1/3/0/8/130873876/rapapuva.pdfIn PDF document text
    • http://files.gaualauf.com/uploads/1/3/0/9/130968937/jabologowap.pdfIn PDF document text
    • http://nixewizo.bishopkelleylapeer.org/uploads/1/3/1/3/131397983/9a23e83926895.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/aeea7bca-8176-4098-a0cc-0e22fc523794/58149876000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8beb8b93-e367-4df2-b620-db6fb6db4c6c/sunobegita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85a9eae-2bc5-4b2f-b3f7-1db7bca3c557/2939771911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d07119-3a1b-4c7c-a6f1-2f79b3ece929/zutis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9074/2948/files/dejipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/lasatufowajidawusoxam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/2747993014.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_off000074d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D2 4928 bytes
SHA-256: f209cec1bd90372f1f5eb8d36ef604aacd50ef3642a624e120d0b74beddd8f37
font_01_sfnt_off0000859f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859F 14344 bytes
SHA-256: b25350010fec4e463b5d944e94daf236ca0580cc28896ed959d624193ee2fed1

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