Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd4f57b8ef24d31…

MALICIOUS

PDF

36.8 KB Created: 2020-10-26 23:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 7ed5d72638f0418eda5487fd497154cd SHA-1: e23ea527bb624274b4ac29e0290c1fa544d350ee SHA-256: efd4f57b8ef24d31d1ad6ae09e88ed7fd1d4453c52d143e14278797f40cc1f78
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.link/123?keyword=andhadhun+movie+watch+online+youtube In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f8b395fdb18d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5f8f3df8b6a40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5f9108ef19e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_5f94bd4f82f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f95aa82858ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5f8bb624beacd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5f8d832587c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5f8ba696d2d4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f8bed44029f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_5f8fd87d27f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f8edb21e76b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004f09.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004f09.bin)
    • https://cdn.shopify.com/s/files/1/0435/4506/7684/files/the_labours_of_hercules_agatha_christie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8400/8603/files/download_apk_editor__pembuat_video_magisto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbdc6be4-7da1-4511-928b-54cc0f60b51a/28621400131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bf98c5-779f-429e-bd1e-f0ea36f657f4/dodofisasemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0687ad47-1f5c-44e0-9b64-13a03c17539a/jirubatajuvoxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c8eed3-fa66-4d68-a89b-d2c642b63a7c/rawozobajabokof.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/b._sc_biology_book.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/bawitisigukabunes.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_off00004f09.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F09 5288 bytes
SHA-256: 63fe0690acc189337a982e130d3066e26592c03f563f1e95f8daab5aa82dc691
font_01_sfnt_off000060f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F2 10920 bytes
SHA-256: 274dc55d6eb2c7c04347508d5b145c6423d171788a721d8ee45da3da3352df6e