Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb662050f847dd4…

MALICIOUS

PDF

40.5 KB Created: 2020-10-04 07:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: b42a1539f8be047f0c707431c190c426 SHA-1: f257ccdab435b3a5b47322269d02824413546832 SHA-256: ceb662050f847dd48290d4b15c0f22bb3daf96e3534d7f8bfacf73dd2a9ee964
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ifrs+standards+2019+pdf+free+download In PDF document text
    • http://files.monzuhannah.com/uploads/1/3/0/7/130776230/kasatitex.pdfIn PDF document text
    • http://files.stevenleeweintraub.com/uploads/1/3/2/6/132681985/3620390.pdfIn PDF document text
    • http://files.fitnessfwd.com/uploads/1/3/2/8/132814155/gurakisomo-murifofuv-rubosidakerar.pdfIn PDF document text
    • http://files.41studiosdesign.com/uploads/1/3/2/7/132741535/f4d9b40704d.pdfIn PDF document text
    • https://site-1038694.mozfiles.com/files/1038694/rejif.pdfIn PDF document text
    • https://site-1041676.mozfiles.com/files/1041676/81153839063.pdfIn PDF document text
    • https://site-1042354.mozfiles.com/files/1042354/diwimiwosajozudoxiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2071/7717/files/91068007292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/ap_english_words_to_know.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0201/9488/files/miller_heating_and_cooling_filters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1258/3334/files/political_parties_crossword_puzzle_answers.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_off00005ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF2 5548 bytes
SHA-256: eb599267f552c96018649d4d17ad37a2977e18c06895566429826f72e547b8d2
font_01_sfnt_off000071f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F3 10384 bytes
SHA-256: 036f22099932e52da1eec264d75a9e895e2936f7d0b867904b2db83e35660d35