Malicious PDF — malware analysis report

Static analysis result for SHA-256 832cf24559545f73…

MALICIOUS

PDF

42.3 KB Created: 2020-10-06 11:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: eaa524ff19a653c23dac312a487e7ee4 SHA-1: 19517e153bcf8b4f10d0383ac6506a2732406cbb SHA-256: 832cf24559545f7379201d975d71c22910a0a75ebf0bd02020500912ef44c3f0
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://gettraff.ru/pify?keyword=sprague+public+library In PDF document text
    • http://files.parisaforoutan.net/uploads/1/3/0/9/130969330/gudobolufosenun-sewazasutevekes.pdfIn PDF document text
    • http://losejube.livinghopemora.com/uploads/1/3/2/3/132303093/9214987.pdfIn PDF document text
    • http://files.martinsugarman.com/uploads/1/3/1/0/131070231/wefevoxo-noporo-dowapug.pdfIn PDF document text
    • http://pibifitu.friendspub.ca/uploads/1/3/1/3/131379769/nejosi-marovudufered-putavedulopat-pifive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbf4233-8757-4cec-b48c-cdfb5c64b9d4/menarotoliwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87aa2be5-7854-4bed-801f-3a77b1f701d4/32483659891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b1bc92-bbc7-4141-9141-5869ad26b28b/19834963133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1046/8251/files/16422752133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/badokevorunonajeralo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3223/5165/files/molle_pistol_mag_pouch.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000511f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x511F 5268 bytes
SHA-256: a5dee348bd67311023c73eaa38a7c2ee72df64e7171f50e0927b8f387dcbba3d
font_01_sfnt_off00006320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 10676 bytes
SHA-256: 00d69f7a3ea8c52b4a6227144975e49236374f8343b02c87f94a65bbf1f278cc
font_02_sfnt_off000087d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D4 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d