Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cb171539d0e42d…

MALICIOUS

PDF

45.0 KB Created: 2020-10-28 17:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 86f580814d2e4b98efa0ef83b83641d2 SHA-1: 92cd34c9d11e70376d8d5aef94f2a7a873114c2a SHA-256: 99cb171539d0e42d2481b3320dcc0f411103cc4dfcab89ddeea89fe1da82d529
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.cc/123?keyword=last+day+on+earth+bunker+code In PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/9480142.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/9275d28.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/2561900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f8ee89705122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f9971ca7285a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8e70381f98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f88fee469a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f883cedefe80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5f8a1482966f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f944da12026e.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/4095577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9350/1106/files/keberokutafimililezuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6271b4e7-b5e6-4896-b002-fed6950d3ee9/fiparewulovarufowab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7696/6342/files/muscle_relaxation_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be43104-89a9-4359-ab32-5e9d544aad6b/50130356587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b823c2b9-06ec-45a7-b71a-54fd30c6502d/96464447210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7464/2605/files/laundry_day_sims_4_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df17a39c-a291-44b5-baa4-740e127fbf3a/gavimenufiniwusanel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c67534-aac7-4a20-b82b-6bc7228b2cc3/40548276870.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_off00007270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7270 5240 bytes
SHA-256: c85cd8ba12d5a78f81306d511f0b0eb3703690819f6227a3262c5cb45aef4fc2
font_01_sfnt_off00008447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8447 10104 bytes
SHA-256: 9e22e15dc26a0fd9aa79bb8800c9d79bec1ae105840d4e39c7b0972fe19231bb

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