Malicious PDF — malware analysis report

Static analysis result for SHA-256 981c93263e1ac18f…

MALICIOUS

PDF

69.1 KB Created: 2020-10-02 03:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 687ad1ba873d7c42955e627d85f37679 SHA-1: a969b6d053cc0ac740cbaec33252e7cd0bbaa69f SHA-256: 981c93263e1ac18fd7ccd64de29759ddbb82824acd1e8b4936bd0e8d0cf2dedd
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://ggtraff.ru/strik?keyword=emotional+quotient+assessment+pdf In PDF document text
    • http://jatofosum.questinfosolutions.com/uploads/1/3/0/9/130969632/5236285.pdfIn PDF document text
    • http://files.jhigleyrods.com/uploads/1/3/1/4/131438111/7586440.pdfIn PDF document text
    • http://likifu.sobritishenglish.com/uploads/1/3/1/4/131406650/tawadusosituxiz.pdfIn PDF document text
    • http://sujuv.willselman.com/uploads/1/3/1/4/131408229/genatavu.pdfIn PDF document text
    • http://files.sanfranciscoschoolofcopywriting.com/uploads/1/3/1/4/131410370/efb95427c6b35.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/dupowuwa.pdfIn PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/54107022216.pdfIn PDF document text
    • https://site-1036925.mozfiles.com/files/1036925/wufizerekavusapefed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6804fca6-eac8-415b-86bd-4ed197584dc9/tuwijegejewijowofuranaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c0c4d9-e502-4f5a-9962-53bd3ea82d6b/lixasog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc4b19c-21f7-4024-bb6d-936be2d3dd6e/45665221931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3846/6471/files/69508698705.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2095/1967/files/should_i_share_my_ice_cream_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5809/2439/files/31083506697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5269/0327/files/autentica_receta_de_coquito_puertorriqueo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/4215562559.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_off0000ca91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA91 5176 bytes
SHA-256: 3cfd058d5e35e71ca05c36d18cc591abaf0ee83f083266ab289f50775f821634
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 13500 bytes
SHA-256: 4872ae0df254a453d83d240b3e7dc0b40d76150d0e99bac5072e352fb72c295a

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