Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b7c784c988750d…

MALICIOUS

PDF

50.7 KB Created: 2020-10-18 04:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e92b3678388fb284fc01061b68651923 SHA-1: 6c1e46740d44eb79f8c3ec8c5548e2f3985658fe SHA-256: 24b7c784c988750dea653f087c98a655a8510785b651262c5f740fbd40fc9115
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://cctraff.ru/123?keyword=garner%2527s+modern+english+usage+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f88a8f9c221d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_5f8b5ac4bf197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f87dbfc8010d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8995/3436/files/cambium_epmp_1000_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9274/5634/files/32018054068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3568/6560/files/98440285789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6050/1921/files/phases_of_meiosis_worksheet_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9972/8293/files/black_and_decker_18v_weed_eater_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0471/0462/2742/files/duneland_school_corporation_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9888/9621/files/felijumutojubojufizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239732a4-4d1d-47c4-b6e8-194860036f71/xamuwawis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796c7f4a-c286-434d-8a83-6bde4c9e3461/33323756188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ec215c-cba8-44a0-b558-ef026f3222ea/59485760304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98791dc9-fe6f-4516-a8f2-c460e006622e/540237117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1841/9876/files/rosalie_jean_willis_interview.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/adb_devices_unauthorized_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0710/3143/files/dolby_atmos_app_for_android_6.0_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6773/6225/files/hiketop_apk_hack_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2449/0397/files/xuvaniworodubomofeduva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A8 5320 bytes
SHA-256: 0d0f28e768e6be2b7b91b22f75a681a25bfe6a3b769ddee88cc636e3c4d68c4b
font_01_sfnt_off00008495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8495 13324 bytes
SHA-256: 3c9475451980b0e01a5b37391079daae629e4c2e650b0a37d6144fbcbe9afcbf
font_02_sfnt_off0000af21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF21 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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