Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b85796cb77d22c…

MALICIOUS

PDF

43.7 KB Created: 2020-08-15 05:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9685cae4ef2d591d70a89b92b19569f7 SHA-1: b1445e5108d238b5c435a0c20ba372d5dcee67ca SHA-256: d8b85796cb77d22c28aedcc94f3930823d48dabbc7b0806e3218752a7e03c81b
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.cc/pify?keyword=aneurisma+fusiforme+cerebral+tratamento In PDF document text
    • http://files.swissalpineacademy.com/uploads/1/3/1/8/131871717/6111461.pdfIn PDF document text
    • http://files.polarcenter-bg.com/uploads/1/3/1/4/131406434/winijafedavafa-vekefafon.pdfIn PDF document text
    • http://files.clewestrunningclub.org/uploads/1/3/1/4/131406365/afa2f.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/1/0432/4953/3088/files/negociacion_en_el_ambito_laboral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nujogopuju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/el_budismo_moderno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/bimibomuwejesuki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/waled.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37741658126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/5200804290.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/niragedupuserivibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3256/7195/files/79169587585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/57592476658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6150/0318/files/justin_timberlake_sexy_back_lyrics.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_off00006d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6E 5156 bytes
SHA-256: 583eea28acb3f5cb10b63cc82ee345fe897604839ac1bb5c5ee42ea2936f8446
font_01_sfnt_off00007ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED8 10380 bytes
SHA-256: e79d63dab6d6dd78e318fafa5def5cee59dc52700ae575c9798d0ddd33d4e53b

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