Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd39bad27260a3d…

MALICIOUS

PDF

48.3 KB Created: 2020-11-06 05:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 404c328713a8b4e09bc77c3b8786187e SHA-1: 16ce1c540d50562b7f4d72cbe4ebf9d0005b3855 SHA-256: 9fd39bad27260a3d72d671d51d94b8d984e6b7508c25fea57a349566cc48072f
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://traffmen.ru/123?keyword=charter+phone+user+guide In PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/6e5d0.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/4a917f44-3b90-4ce6-ac09-4f3e43410c2e/neverwinter_nights_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64131e32-352a-462f-9cc4-9feeb5ac19ba/3793785762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad1e118e-4f76-4e9b-a868-23a19382687b/toque_de_bandera_letra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7816/5684/files/bakabogogidepelixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f5243e-7d87-4b7f-95bd-e423dcf83efc/sansa_manual_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9257b270-80e7-4977-b3be-afa6cf0bfd4b/bilojunisizapodusoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ddafd6-4d06-4da8-9c35-7d297eaa1a50/algebra_puzzles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8018d8eb-bcae-4f4f-b942-abc802445979/61124973958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ef5314-96c8-455e-a770-6d284d460243/kulapelozatifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4195/3187/files/pimikiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aec7e91-43cc-4156-8671-18d6e78c21d7/quotient_power_rule_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e17587e-fe2b-4d52-a32c-e51bdf49cfde/loxifizesuwipofaziputazu.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_off000080a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A8 5096 bytes
SHA-256: 532b3549686fc019ba0015d4d55c22ffdffdf26cf5544fce0eff09f22e2eb932
font_01_sfnt_off000091ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91ED 10208 bytes
SHA-256: 96237299dd12fa995cb5754070226b429602e7180e87084d5c34ffd63ac03bc4

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