Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42c51b12d9c2079…

MALICIOUS

PDF

43.6 KB Created: 2020-11-08 18:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 9716bbe882bde299764e38e4cdc74d98 SHA-1: 01d4c22e357b9bed7311d6ca75bc62f03765d3bb SHA-256: c42c51b12d9c2079b3f7ccf3d942a3346c1a9d5dd56e048bccc0b8086dd695bc
176 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://traffset.ru/123?keyword=zynga+poker+hack+cheat+tool.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?keyword=zynga+poker+hack+cheat+tool PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5f9351ffce830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420438/normal_5f9bfc32603f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5f995e1cdd41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fa76ccd8b22e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remeranexe/dd_5e_resurrection_spells.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/buy_cigarettes_online_marlboro_100s.pdfIn PDF document text
    • https://mivepir.files.wordpress.com/2020/11/the_cask_of_amontillado_questions_an.pdfIn PDF document text
    • https://jirovujama.files.wordpress.com/2020/11/givaxegiforadi.pdfIn PDF document text
    • https://buvimed.files.wordpress.com/2020/11/reactor_idle_city_build.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/pejukikipuxonuxob.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/pdf_market_leader_business_english_course_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/metuxugasetubatevufugu.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/kifiwaxizolisud.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/jcb_service_manual_free.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_off00005e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E54 5140 bytes
SHA-256: dc1a6e4a8767986113bb3620139148351583782577a7923b3412f843238741c1
font_01_sfnt_off00006fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDC 2092 bytes
SHA-256: 6e5de5c6bcb7fdd8c5ca0d25823a8f80e6c764803c1b732dbc9c425a5c0f8ea5
font_02_sfnt_off00007982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7982 12156 bytes
SHA-256: 1dd06126dab3492588133b642f778a3f4698ddc3321091cfd16e955b352a1f65

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