Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ff406b3457f358…

MALICIOUS

PDF

42.6 KB Created: 2020-08-14 10:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a8f40acd1fc2fbfe27f74cbeba79160f SHA-1: 2d12a66e797044306b014f0146748c559d04a9d5 SHA-256: 41ff406b3457f358e28b8247b4e7bd16e730c60517b3d7f3b6f4711913ff1640
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://ttraff.ru/pify?keyword=analysis+for+office+2.+7+administrator+guide In PDF document text
    • http://files.dldtassociates.com/uploads/1/3/0/9/130969184/vufunat.pdfIn PDF document text
    • http://files.montanalanguageteachers.org/uploads/1/3/2/6/132695513/tedonaxad.pdfIn PDF document text
    • http://wuvunedaj.centerforspiritualawakening.org/uploads/1/3/1/4/131482995/xijokojuz-vekezikopapike-zifanaj-napore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/kinanemokujulotojiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3631/0693/files/tuzawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2919/1066/files/banerji_protocol_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9370/4350/files/brew_permission_denied.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/80849609240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/kudoxifis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/rojusukonexojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/gufabesu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/bamoraremeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6489/3345/files/jejosuwegewo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D2 5560 bytes
SHA-256: f2a4adc4ccc3af50337defe3dfc9b2caee4dc196a87f221dfa7a334a07272101
font_01_sfnt_off00006caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAF 10084 bytes
SHA-256: c1d9c9385a252d6dc4008c357d3515fe0cf991f4c2d0320dc6eab68691335634
font_02_sfnt_off00008f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F33 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378