Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4598cf22b6e67d…

MALICIOUS

PDF

42.6 KB Created: 2020-11-03 02:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 16cf9ab11e315d20eee8063751bd5d26 SHA-1: e9c08b83d072cf1e58c6c4cb108dac5041abd265 SHA-256: 4b4598cf22b6e67dadae599c6fd62582d597e139c0204d10fd323186ea7ac41f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that triggers the redirection, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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.com/123?keyword=sun+in+cancer+in+8th+house In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f9719af0ffc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f8dc3cb97ec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5f9c5fcc7d265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f88de5871e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8c14caa6b52.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/ed2929de-5aa5-4cfb-98ae-25fa0a855be7/xejuxuwobasux.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/42347931068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0642/5760/files/pathophysiology_of_acute_glomerulonephritis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7358b9a9-f9d3-4195-98ab-986d790e197c/64660715956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09a060a-5f78-42eb-a398-77f585944619/8093301530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6499/1649/files/kifixibiwisosuzaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431236da-1ab1-4c1a-af3c-614f87340fcc/xuposezusevupedadawesebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3382/4927/files/manual_encumbrance_certificate_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8b3e1b-f3d7-472f-b10c-bd47e6cd72ad/quavo_huncho_album_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3de492a-c882-48ac-b10e-c0fedd5053bf/27340900185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0540/0472/files/jugajudavowudefotiba.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAB 5152 bytes
SHA-256: 79746f494956066b066926c02ea6256f1a974fb58b9b7520b6c97077404ee1ef
font_01_sfnt_off00007e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E26 9136 bytes
SHA-256: 4915d105839337a2293f5a52c12da734e7f44cfa30c15f09bf47a593a4303153

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