Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b27e5dbb4ff3361…

MALICIOUS

PDF

52.1 KB Created: 2020-11-06 12:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: f212318de75d4c8a347f486f96bdfd34 SHA-1: 3622edec4c225e0e9530aa9558bcb51e7eefc122 SHA-256: 4b27e5dbb4ff3361b82262500ef0813d0d3d1b5d657207303bfa2ca4ed6269ad
242 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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://traffking.ru/aws?keyword=pirate+proxy+list In PDF document text
    • https://lukafitujukeme.weebly.com/uploads/1/3/3/9/133997152/172666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8725753611b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fa2728d4abc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449192/normal_5fa51a9540280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5f9e896827f39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f9c94028b374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5fa3efeaa4a0d.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_5f8f25e97a13d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8c4c14135bc.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/lemuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414175/normal_5fa493b160a33.pdfIn PDF document text
    • https://siwikuzovusodig.weebly.com/uploads/1/3/4/3/134357046/64eaea4e.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/1/0503/8522/3878/files/ejercicios_cinematica_resueltos_4_eso.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_off00008f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F73 4984 bytes
SHA-256: 8b18ab0247ff02880a309a3eb4a870141dd8cc74bc371b4efdd1e2a9c291ea68
font_01_sfnt_off0000a078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA078 10396 bytes
SHA-256: 0f4515c054cddc2dfcb3c544489d464f3f97ca78829365f9acbd50dc9612beb3