Malicious PDF — malware analysis report

Static analysis result for SHA-256 b989b3b7f453022a…

MALICIOUS

PDF

33.0 KB Created: 2020-11-07 13:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6adbd3bff5347dcff0bc08233e5e0b2a SHA-1: 1006562dd97831b503a5e12c897855bd0963d49c SHA-256: b989b3b7f453022ab4cf3d69f11a12a339fab5c3a585d11c728da4f3cca9223f
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and contains a large number of external links, many pointing to Weebly-hosted PDF files. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure itself contains embedded URIs and link actions that point to potentially malicious or unwanted content, including the URL https://traffine.ru/123?keyword=goldstar+microwave+handle.

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://traffine.ru/123?keyword=goldstar+microwave+handle
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/tipot.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lonevu.pdf
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/kovidomibutezifita.pdf
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/mobirakukiziw-sobetekiveku.pdf
    • https://pibazafefudo.weebly.com/uploads/1/3/0/7/130776509/7838584.pdf
    • https://sikinuvozo.weebly.com/uploads/1/3/4/4/134451197/jeviwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/17728918-bba4-4326-8914-52b18f00f9ab/79854159918.pdf
    • https://uploads.strikinglycdn.com/files/779c029a-412c-4ca9-9756-28ef4648c855/duladomusef.pdf
    • https://uploads.strikinglycdn.com/files/770291c4-ad94-4a6c-a0a1-09df8dab3199/27806393248.pdf
    • https://uploads.strikinglycdn.com/files/ddd6814f-df7c-4ea6-b049-82c1b42ad810/96995127102.pdf
    • https://uploads.strikinglycdn.com/files/af20c8d4-3e20-4b63-8a43-80624cb7054a/46239053667.pdf
    • https://uploads.strikinglycdn.com/files/02d5f848-a791-4bce-bf90-276333f0803d/rare_british_old_coins_price_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042a1.bin
2335c617c072926e8c89b460111750f5c83dfdd378c44803778a23c81953c196
pdf-font-stream PDF embedded font (sfnt) at offset 0x42A1 5364 bytes
font_01_sfnt_off000054ca.bin
dadd3018127af57f38de283adabcdf6c678a51eab5bbb2a0b8a1f1cdbc5fd753
pdf-font-stream PDF embedded font (sfnt) at offset 0x54CA 10252 bytes