Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18c24051be1c523…

MALICIOUS

PDF

40.6 KB Created: 2020-11-08 07:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 447916a4b67db8eefb674a9fcd9630b0 SHA-1: 2d527e1bf5fc6632181ad4fe56b7d0f9f1cd1bae SHA-256: b18c24051be1c5230c79b5c1ba33b69094b557eb4cd652bf41f7c895ab25d1f7
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://traffmen.ru/123?keyword=answers+to+cell+concept+map In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fa5120dcc0de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kolinaxud.files.wordpress.com/2020/11/sutuwodevoboba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6a8f6d-4fff-4433-af0c-a8f8dc226e06/wakotimiwomebuja.pdfIn PDF document text
    • https://luvigorabu.files.wordpress.com/2020/11/breathometer_shark_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68399f1f-0388-442a-a24e-b0831764f80b/idm_patch_64_bit.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d7c146-987f-4e40-ad86-008505be7db6/5637072945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be06d75e-742a-4f3e-83cb-26186e22c288/58293944495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd39cb43-6123-4ebb-ae03-315c735a171f/10791437480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e173ae0e-1610-40d4-8ae7-aadebc88eea0/83710763328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210c5037-6079-4573-885c-6b08fbcdb6a7/selowodonaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853bb00c-75d1-470f-8fcf-fc43b1386d05/zonabixajuxogoliwopifoba.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_off000062a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A8 5160 bytes
SHA-256: 050b9aea2246801e9d171ae46bc90c145107f8a63dfcc3aef76e4ffa2f5d9ca4
font_01_sfnt_off00007430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7430 9880 bytes
SHA-256: 7ce37b3087e4f8a760bc33401cddb99487f366d32b17e831ef0b1415785fdb91