Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ff2f0503018c66…

MALICIOUS

PDF

44.0 KB Created: 2020-10-10 13:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 7d4e7c82fc3ca1811ab4b0a513d4a7bf SHA-1: 3592a159b613fa1ba3a5905622ad54d766befffc SHA-256: 42ff2f0503018c66cc7e6fbda521af8f6f1f39cee78b45f66999d49118c1ff1b
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://cctraff.ru/strik?keyword=official+nyc+subway+map+pdf In PDF document text
    • http://files.krugerconstruction.net/uploads/1/3/1/8/131856170/a05231ef0f814.pdfIn PDF document text
    • http://files.smartcityboost.com/uploads/1/3/2/6/132681390/1799747.pdfIn PDF document text
    • http://files.escoria.com.ar/uploads/1/3/1/4/131454306/caba000.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://uploads.strikinglycdn.com/files/ce783e27-7479-4772-99f0-55de7da75a80/nadexiputixonuruxofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef24f6a6-6458-40e9-817b-a84c81c71488/43439923634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69463e68-cfc8-4d1b-b59c-825cdaa03168/50439620883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0e5991-daef-4f0b-a6e4-2877cd766c1b/tabume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7786cb1-f694-4058-a36d-b2cf205d7b3c/zafojip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37f3cb8-2974-4b1d-b3ee-1f8f446780fb/54329670447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa66d10-5dc1-4f0a-8504-2a490bcba7cd/vapajanawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf2969a-7c34-45be-a17a-b56cfc431698/xutezede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbd867a-f2c0-473a-a32f-7a2ab69c623b/wefenukavurazazipixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2249/1553/files/blue_sky_mine_lyrics_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4312/2071/files/wukekef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6893/2767/files/fujegazevoxe.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_off00006196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 5140 bytes
SHA-256: 099b2fce260fb0e152b79ac56856590a0e2b1c31d23a21984634409750d4e726
font_01_sfnt_off000072fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 9948 bytes
SHA-256: 32560caf16030a66f4525088bdbbb9546d37dea7bd417b5455b48c43e517f811
font_02_sfnt_off00009508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9508 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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