Malicious PDF — malware analysis report

Static analysis result for SHA-256 263df6e58a69f0b8…

MALICIOUS

PDF

51.0 KB Created: 2020-11-03 02:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: c86f024ccb580c7bfeb69cfbc273e071 SHA-1: 9a80d45ec98cc5ffffb332ce1cd36f6f9d292752 SHA-256: 263df6e58a69f0b8b56b736957ba4bada0230b691c159135140d7e84ede9c94a
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/aws?keyword=words+with+repeated+letters In PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/2fb9c5.pdfIn PDF document text
    • https://mazaxijav.weebly.com/uploads/1/3/4/4/134488449/86d96e.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/banekiririgu.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/bakeloti_tuworonovof_lezafawov.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000088c7.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000088c7.bin)
    • https://uploads.strikinglycdn.com/files/17b704b8-dd82-492b-9106-d61c5427cb53/56536878000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/1454/2269/files/bpi_rank_meaning_higher_or_lower.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/14595156584.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5161/1827/files/clear_vision_3_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/40314631016.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/old_ncert_books_download_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/chemistry_book_class_11_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/17745815691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10049c2-568e-4c4a-b6cb-7676d949ed11/51101776239.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_off000088c7.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C7 5152 bytes
SHA-256: b66e7a5be1e1360686437f578c7becf851952ffc92680d393f91417a3b6504af
font_01_sfnt_off00009a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A5B 11356 bytes
SHA-256: ce8b9495206d1905afb7ec6c21eb67cf862cd9fe4dd0dca43b9f318e9facc1b5