Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e38c4195556478c…

MALICIOUS

PDF

48.2 KB Created: 2020-10-09 05:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 385ceb22fab851b82213d3209ca4d413 SHA-1: 2b7caeb23f5a4aa3c8680ab944931ff4b34d2a08 SHA-256: 8e38c4195556478c03aadeaceb9c6195cfe4eda38421d9c31fa4ec429c4a00c7
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://ttraff.cc/pify?keyword=sistema+nervioso+periferico+funcion In PDF document text
    • http://files.77thmeridian.com/uploads/1/3/0/9/130969148/81285f.pdfIn PDF document text
    • http://berevoge.barryelectronics.net/uploads/1/3/1/4/131437693/9328722.pdfIn PDF document text
    • http://rijezod.scarlettrocourt.com/uploads/1/3/1/4/131453832/674050.pdfIn PDF document text
    • http://murumaji.eatsandexercisebyamber.com/uploads/1/3/1/3/131398101/lubibene.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/f8e7a5eb-d339-462a-86e0-d2a15d95ebd9/pilimusexuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f7a9e8-0298-4762-9b1f-f0179e8d4dc8/10463396130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93093a59-ce2f-4e83-9897-73fe87fcdba3/83596252774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2c81fa-90bc-4435-a5ea-1b96f2925a63/88146903613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc94549-52cf-4f7e-9f26-fc31a9234d6d/37744351578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf75ea5-b715-4e96-8150-d0eb64762f42/dozulufug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01ef7a0-50b3-4b34-8ef2-19ffb1ccdd0e/47728079956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f89348-78e6-462b-9b19-1b4f81cb98e3/kixusebibigakure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e8bf07-de2f-462e-adda-bf7c57eaa085/30115036755.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_off00007c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6A 5292 bytes
SHA-256: 2077831972637828cece502b62243bb871463e410e20678bd0ff66c3631978ed
font_01_sfnt_off00008e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5E 10940 bytes
SHA-256: c77358243199f76039d9a37502e14d35e2740c426ef683133df2e7d2de9e05fc

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