Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8e81320b0d63e6…

MALICIOUS

PDF

49.1 KB Created: 2020-08-19 03:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f239bd92364d6bb6b3a72e4a076dd5d9 SHA-1: 6b69308ef61560738e0aedaa124f811755b343ab SHA-256: fc8e81320b0d63e637140f3aa45ac01628ec9c02cc9ea79262009b6d13a812a3
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=company+brochure+template+word In PDF document text
    • http://files.3sistersgrace.com/uploads/1/3/1/4/131453348/9490340.pdfIn PDF document text
    • http://xawaruki.twostallionsthailand.com/uploads/1/3/1/1/131163908/5482118.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/1/0432/4638/7367/files/94324112778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/dumirolusejepokewowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6549/2127/files/domestic_wastewater_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/rusuvuzutokusodabugabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/dixatuzaxapokovaxiwena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/48578165570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/fosugirofigebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3797/4940/files/exercice_algorithme_avec_solution.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_off00008216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8216 5376 bytes
SHA-256: 85f5f4ed5474e23e0386d9e44d33793ffca469b60496c2c03fa7e86387992f55
font_01_sfnt_off00009439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9439 10544 bytes
SHA-256: 7ca2514a9dc20f3eae62705f5dc1ef9a7f6fb44f3d90d03a69c76f7e01c7ba38

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