Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4f97115f065ad3…

MALICIOUS

PDF

49.3 KB Created: 2020-10-08 14:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6cf455c31582d2bc8a51377909619713 SHA-1: eb37f88d9fed2421b61b217a115f2bb7df7cffc7 SHA-256: dd4f97115f065ad3ce03461170fc99366501e4494605b83f20428fcdd6ba12b6
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which is identified as a malicious redirector. The document body, though partially corrupted, includes the same malicious URL and other links, suggesting a link farm or redirection attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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 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://ttraff.me/pify?keyword=what+is+a+wenis+really+called In PDF document text
    • http://files.paulvardyart.com/uploads/1/3/2/7/132710783/1c311d18487.pdfIn PDF document text
    • http://files.stringsviolinlessons.com/uploads/1/3/0/8/130814586/xujupemajakirib-tamililodinejiz-jukuxavatozemaj-walidelu.pdfIn PDF document text
    • http://files.belchingbarista.com/uploads/1/3/1/3/131382320/wotowewoluvula-zepaposix-pojubusa-ketoz.pdfIn PDF document text
    • http://vekujix.driesneyland.com/uploads/1/3/1/6/131637365/zinukukozelubew-nivodip-lexeruzu.pdfIn PDF document text
    • http://files.danielakphotography.com/uploads/1/3/0/7/130775191/malopa_seburusitu.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/16d92740-e153-44ba-8705-11727c83214f/kusadovagozogafomez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ab7b6f-0745-48ab-be05-0418ead48b2d/zeravuvoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ac3f10-ee39-42a7-92a6-daf54402e3ea/71683077217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531f6e8d-e865-4d16-8fc0-ec38c7f166aa/41885907095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b150cac4-242f-413b-bceb-ebdc31b9bf85/sefaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c52c759-966e-4a7f-91d1-dde53bd257b8/77545128597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa219849-43c3-4ffd-af86-9b2e0ea29e7d/98739822218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b719b2-0bc1-4179-a904-8e599ca06b55/nisofusuno.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_off000063e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 5232 bytes
SHA-256: c7fd793e308a90bf323e17413b1168ab81f27f5913f5ed16640216135cc9c570
font_01_sfnt_off000075c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C1 14300 bytes
SHA-256: 3c4549aa486cf86a10d4ffe85a8a8da1c41ad1984ed0215146d72b72096130f0
font_02_sfnt_off0000a37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA37B 16144 bytes
SHA-256: fd7a2b07845a6b20703bf8ee43b663e426110e66bbdab86dd6246a9e63ea818b

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