Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efa457e7a7450eb…

MALICIOUS

PDF

51.5 KB Created: 2020-11-08 08:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 8a8cac6a9b978cbc3bf06a4d380c7a8e SHA-1: a9a4bb0e27d2231a4825435d727ec7570bc3a792 SHA-256: 5efa457e7a7450eb2e0558d20137c4afc338cba14f18a96dad04c9fa464fc7bc
84 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=hello+neighbor+apk+download+alpha+3+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f8a2c3a1e0f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f9a2c2ceaacd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f8a35ed701a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_5f8f2909b689a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5f90d676e9554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f93dc395b3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5f93469bbefa8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/prefix_to_postfix_leetcode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d30470-0faa-419a-a826-38a2c0254913/86730527478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e97a5e-d052-4446-aae5-4f995fdc8d1c/43288587145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b860cbfa-c7b8-43a4-b2ca-cb86b63c8bfb/bakumepower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4a07ac-128a-4591-a570-50f0d3a758c7/14129792549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d019e189-89a3-4880-a258-1d310f92fe11/metabolic_conditioning_workouts_body.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/mozinomerinovir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f45c17-ff12-41e5-86c8-52af7ebc3edb/51951315631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b65ac7-1516-4e84-a8c8-c49727eee4ee/chemical_engineer_handbook_free_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4fd18c-cbd5-475b-96bb-00abfcc1fce3/blue_collar_brilliance_rhetorical_analysis.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_off0000899f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x899F 5580 bytes
SHA-256: 8acfb0fded7a9d3c95ecfdbb505d9f833a0135da7a42781a07cd239cbc302ace
font_01_sfnt_off00009c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C9B 10532 bytes
SHA-256: 50427fcca5eda05acac1b4564b98ff5a626855fd65895381742a8c4d19169279