Malicious PDF — malware analysis report

Static analysis result for SHA-256 66868757fc46f2de…

MALICIOUS

PDF

39.7 KB Created: 2020-10-10 11:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 068ba8b76de24ef4df59b3cb87b17465 SHA-1: ab7fa9f4d00bd5e373a5a5ae36b43ea92949fcab SHA-256: 66868757fc46f2de3488f3505b3330cdda305ef23155a3a3078072a7b3e8fd41
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.club/pify?keyword=psychiatric+drug+book+pdf In PDF document text
    • http://wulujufuv.fblatn.org/uploads/1/3/2/3/132303001/9882741.pdfIn PDF document text
    • http://files.nbltwowayradio.com/uploads/1/3/1/4/131437107/1973364.pdfIn PDF document text
    • http://files.tomasosinski.com/uploads/1/3/1/4/131437246/80a374c93.pdfIn PDF document text
    • http://files.ryanmohler.com/uploads/1/3/0/8/130874125/melutejijezoxak_gobonubube.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/72169e64-4cb0-4338-8f2f-254eec2b7eb9/fawibofokezovus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3d348e-44fe-4956-94e5-d798f582df43/waxagudasukusolelekolibiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e3e0c4-ecac-44cf-ae33-ae537515ab21/gibopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78865d3-aa40-4928-8294-6d1831e8837f/rinaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4a7273-3937-4188-a56d-f2c47cbf4fd0/kuzesob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3184/9881/files/manual_backup_ipad_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7046/2373/files/instrument_panel_cluster_fuse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1116/5336/files/zafitebisepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36362894-dc68-4caf-915f-630b0bc81884/tixazepow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1900b426-f4fd-497b-be6a-e846bf3dc110/zabazasuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ca5cf4-5d91-45cc-8837-092c46780eab/65163536662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646c71cf-12d1-4afa-9b67-67311848d974/19552805409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d9f6cf-2a88-4ec9-9afc-c210c0636d9c/89423378078.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_off00005d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D89 5692 bytes
SHA-256: 3808afe9d1eec40be42d57e688b30d48d2ad1b7e7b3d7c43ab3cdd082cce3955
font_01_sfnt_off000070db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DB 9848 bytes
SHA-256: fd199e54b01f4bcb99d36dcaf02551268f917776d2ea19ff03e828428518ac0a

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