Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bdc741b845e268…

MALICIOUS

PDF

44.9 KB Created: 2020-11-07 13:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b9e4515f3f9ef1de12498e35de0440f0 SHA-1: 9044d7e384cfa0b2ecabab50c4f066df516b24e4 SHA-256: f8bdc741b845e268ac86a7e16d883384deee2b066b5fe1da50deb51d6d94e712
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO link farms or to direct users to malicious websites. The primary URL, https://trafffi.ru/123?keyword=junji+ito+tomie+complete+deluxe+edition+pdf, suggests a lure to a potentially malicious site disguised as a search result. While no scripts were directly extracted, the PDF structure and extensive link farm heuristic indicate a malicious intent to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=junji+ito+tomie+complete+deluxe+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5fa1f8dde57e3.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/043b9870-47bc-4679-a753-ecca21dc8f92/vuzonevoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0061aa27-f632-4363-88a0-f8ec91c13f90/wadevixitoludoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b5f613-ddc7-49c9-85e9-c00675c6708e/xusanusomubikefodepolon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78aea798-33fc-48c0-adf4-814fd08e4faa/4257377567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2737a0-edeb-473f-95d9-52fe1a884456/vumodifakok.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8255c130-5029-4478-9b9b-7213823cb511/17537239476.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/cabanellas_diccionario.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/bullying_escolar_en_chile.pdfIn PDF document text
    • https://s3.amazonaws.com/fufaragebo/ziguzatitezabaforogum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4ec693-22c6-47a8-8079-a1bd204327a9/riddle_school_6_game.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_off0000692c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x692C 4952 bytes
SHA-256: de8f3c361b4deaf4503801b06317da685bef37e95ee95bc9eb373e94da168279
font_01_sfnt_off00007a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0A 13736 bytes
SHA-256: 8618aa3301289ceea1671d637e22bfe7db7f06c6e208551e95cfc1864fd52ef7

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