Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bc19b588d790c8…

MALICIOUS

PDF

40.1 KB Created: 2020-11-06 12:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-02
MD5: 008543ab4488e39c679a5b5f56ab3a60 SHA-1: 2f9b4a4a48384a7dde4380832c743498c126029a SHA-256: a4bc19b588d790c8401e114ebf3ffd93ae6ab4ded8bf843fe62cd00c8a1f9c97
174 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.
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/strik?keyword=find+office+product+key+command+prompt In PDF document text
    • https://fexatawolev.weebly.com/uploads/1/3/4/4/134445796/7854722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f9c65cd7b636.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/adversarial_and_inquisitorial_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5f962098e4eb8.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/wajuvaji.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/78968098243.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/negorobewex.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/anemia_hemolitica_en_el_embarazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005d1f.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005d1f.bin)
    • https://uploads.strikinglycdn.com/files/3f619e59-5630-49bb-98fe-b35ffbd011e5/stardew_fishing_bundle_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4724c7f0-ae47-42b3-b453-636f96839fec/lagopumukitemokonovepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6479/9644/files/bokujepodivejore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c86681f-25ee-4b69-abbe-e2f6728e9509/mta_car_inspector_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edc9768-3bb6-440b-8c63-1365f6d8b8c2/technics_1210_service_manual.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 extracted file (font_00_sfnt_off00005d1f.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1F 5212 bytes
SHA-256: 0ec9b5ac92218535334505952a68d7ffea4f21803afba46513d4528d915abd49
font_01_sfnt_off00006ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED6 10792 bytes
SHA-256: 72bb9a85463bdc7ae128707b7e99654996204aba733cacad73251aaad426fede