Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b47f9f04ac9dc2…

MALICIOUS

PDF

50.3 KB Created: 2020-10-25 05:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 9aac923d8d3c70b1f967cb50dbca6e3b SHA-1: 354215516733449a4b8814de6d6f3144152e8436 SHA-256: e1b47f9f04ac9dc22044897d0523d95449b9f81419d86a8bbcee5441e2608f4d
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/123?keyword=makkar+ielts+writing+2020+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f8705d9be710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f9234abbfdb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f90656dca228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f9059254c492.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/44a5ee.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/3325135.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/xelikanotuzifaja.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/bdfb4428-58c0-407a-829a-938936d99b72/bufemojizes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17640f37-3dd1-44d0-ba88-956c04202bc2/16496552146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefa9ecd-582a-4d74-873c-31860666a842/bolupobomatima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb27d31d-78be-4f97-b1e8-f62e6beef06f/buxajiromamax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c990f330-899e-4fdc-9fed-a5baf5cbf5f5/53877865025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb8e7b4-e35e-463e-970f-8195a36f1917/kixakokexewimokiporazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca17f21-503d-48d9-985e-d0add261f84d/fitaluwupadefoboxux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce73c78-6e9c-421b-bfe4-6264aef999ce/31057304027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2b784f-6a46-4eea-a9be-d939ba6b94bb/vuguxaxerabaximumit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e762394-c87e-488a-94a2-2853d00ead64/precalculus_with_unit_circle_trigonometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c814a7f-0876-4eef-9f75-e4ccd0493f31/kutal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0db1d5a-6e2e-4cf8-916d-b1c8e27ab671/vapiwozebezil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8147/2929/files/afk_arena_codes_may_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8010/9218/files/ka_stand_in_chemistry.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_off000085d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D4 5644 bytes
SHA-256: 0ceaf337988029fd253e080dd331afe581078d335a0eb1576bf5a65724de5380
font_01_sfnt_off00009945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9945 10312 bytes
SHA-256: d0119dbe67b363b78d9e532e0d2cd3ff6ed88d486d260c7f95429a60d401fc6e

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