Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41164a5bc29a137…

MALICIOUS

PDF

40.2 KB Created: 2020-10-31 14:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 83e40fcebb9f7bcc5bb271af7b3137a8 SHA-1: 9dc284da4472e7c219c9117c2b3b0b1fb0c24e67 SHA-256: a41164a5bc29a13777286775f7c8be3128669fdfd329a9822fb3ce0fe5dcc428
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://ggtraff.ru/aws?keyword=unfinished+end+tables+canada In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f8864f802f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8b3e5c90990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f8d1b18486f0.pdfIn PDF document text
    • https://jobikituloxexe.weebly.com/uploads/1/3/4/4/134456837/8514926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5f9cfaec67ea3.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/8abda614-8f89-4a9f-bdd0-5403267cf664/gopovoragaxas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4646/1852/files/78897719714.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1229/2260/files/administrador_de_dispositivo_android_google_device_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214210b3-3fae-4fed-bb13-2255b2451fdf/77114150818.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/26943654967.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000457a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x457A 5144 bytes
SHA-256: 69cc269001dbd252bf2093eb3d53ba53195d18793a15d2ed25b4495b1682e8d4
font_01_sfnt_off00005700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5700 10120 bytes
SHA-256: cbd4b5a410635423ffe794c86b4d475583e6656e3c2445d58b636fb5bd1f2936
font_02_sfnt_off0000799d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799D 17756 bytes
SHA-256: 9cd10e72ad74735214c7a492b85e5cf3e77f4851c4306864dbb2517c8a417a23

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