Malicious PDF — malware analysis report

Static analysis result for SHA-256 522ebde2243206d0…

MALICIOUS

PDF

47.8 KB Created: 2020-10-05 11:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d20ad8c544dd58c72ac09ab961e819d4 SHA-1: 8110295d10769a6a460c4d1ff5d5f740a7320ae3 SHA-256: 522ebde2243206d0808667af83d7b64523d2f749f879b0b3cc9a42a40a55f99c
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://gettraff.ru/strik?keyword=ejercicios+de+agudas+llanas+esdrujulas+y+sobreesdrujulas+pdf In PDF document text
    • http://files.comedianambrosejones.com/uploads/1/3/1/4/131407227/dumitumirebekexevox.pdfIn PDF document text
    • http://josodubo.zippitydodog.net/uploads/1/3/2/7/132740212/3bbbed45e1.pdfIn PDF document text
    • http://files.albertfpark.com/uploads/1/3/1/4/131454500/534a6fb0fda3cf.pdfIn PDF document text
    • http://files.cecilyeiferle.com/uploads/1/3/2/6/132681460/d59f0d68b015fc.pdfIn PDF document text
    • http://files.rdpresets.com/uploads/1/3/1/6/131607827/jexasinonuz_vifimiranetow_fagutipibivig.pdfIn PDF document text
    • http://files.laurelparkespta.com/uploads/1/3/0/7/130775130/9101fe38c.pdfIn PDF document text
    • http://bisofofa.theloveshanghai.com/uploads/1/3/1/3/131379737/578ca.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/1/0433/7103/6835/files/91201667245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5123/8047/files/40071972606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4824/1818/files/kuzowabubatosupubamimuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2047/0432/files/maiores_cidades_do_mundo_territrio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/resiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9571/0113/files/pathfinder_playtest_bestiary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7868/3291/files/67495463209.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_off00006394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6394 5400 bytes
SHA-256: c9b32869b5106695fbed59b7ce689f8b98cacfa339b3a045dd5d7e3c35667ca8
font_01_sfnt_off00007600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7600 14300 bytes
SHA-256: 86f46e5522135a1c82751090aa97e472b4fdfcc4c334cff5af865b5c8cdd6d9b
font_02_sfnt_off0000a193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA193 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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