Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db2ab1778e9088c…

MALICIOUS

PDF

58.8 KB Created: 2020-10-30 21:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 9ef770e96c1cb240ec3bc0d9f6c4b950 SHA-1: f421e58fa6892e26315a0c0fb88ab34dafe768f3 SHA-256: 4db2ab1778e9088ce6a1c71d9fd8f6738a45168ec8a8a3286c346415a1ed8d59
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=what+is+gdi+turbo+formula In PDF document text
    • https://xapinetevum.weebly.com/uploads/1/3/4/3/134330578/gulojematuno-konan-fazepikiga-buvilubifudavok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f89af332f7c4.pdfIn PDF document text
    • https://masogipu.weebly.com/uploads/1/3/1/6/131606875/263e5989.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/zinovenirusaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f92548c615c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000a378.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000a378.bin)
    • https://s3.amazonaws.com/pazifetanegapu/benim_hocam_tarih_video_ders_notlar_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/lavonulerawurujo.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/votoxunamoroxa.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/nosawo.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/bible_study_outlines_tagalog.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/define_educational_administration.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 extracted file (font_00_sfnt_off0000a378.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA378 5476 bytes
SHA-256: becad4482b8c10fa2b932c218720a83f6e91dab4559c1eb708e77a475a7b8c67
font_01_sfnt_off0000b5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F6 12512 bytes
SHA-256: 344ac382c60797be40ccedda6c755a891358a28cebe49aab539d8a1abc8955a6