Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9ec74329249e73…

MALICIOUS

PDF

44.4 KB Created: 2020-10-30 19:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: c3876bcfeba73c8c03a77735d6311d06 SHA-1: ad7f47b2f9eef5f443ca7415671143dc6cdd026e SHA-256: 0a9ec74329249e73edcc5e930d8ca839066ff027c3d525cab02ad670e5ededf1
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.me/123?keyword=batman+arkham+origins+bradygames+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f945c20182f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f88b49ed2d95.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/kexuvol_zidured.pdfIn PDF document text
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/3720539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f884d4a3846c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f86ffe2bb67a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f976f53ecf39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/borifoneraxazipulunafasan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257dd981-7d34-48b1-9712-131fac73e310/95575419385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8792dc-22fc-4fdc-9d66-e0bf50e99faf/honda_xr2750_pressure_washer_gas.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/50026217048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f3e72c-73fc-44f5-b20b-9a53eba0c9ca/zupoxumivamaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/kepuzuvejeruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fae3ca7-aafb-42ac-b321-834696a5bad1/kebikenakota.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_off00006d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5E 5780 bytes
SHA-256: d91dbaad786b78a6dd007e40c83a26763a4c71b9cf35d529c7a83e789bf8cf5b
font_01_sfnt_off000080ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EA 10296 bytes
SHA-256: e117bd3cf36397d695a0fdad46f974185af8861169cab4f9e2a9a4ce04d4e7a2

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