Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b2a8db00d22482…

MALICIOUS

PDF

54.6 KB Created: 2020-10-31 18:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6e3054361890cc67a06a384d90923f40 SHA-1: 23163b927bdad41e52be4e46be5cb0dafedee2a4 SHA-256: 48b2a8db00d2248295282da5dfa10fa51038c6881e7f4e69dfdde2c1218d3f52
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=list+of+likes+and+dislikes+questions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_5f8b659f6e99d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5f94a0aac8614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8720/2971/files/crop_pages_from_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f595616-2964-4cc3-bd2a-5ca5de931488/xudajulefefusas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a34df36a-5280-442f-977c-950351ff0a16/vuwosomusalizupewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a505dd78-7de5-4056-bf61-b675a0b2071f/quien_invento_las_fracciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126f16dd-71f0-45c8-859e-47adc691db8d/chevy_truck_manual_transmission_swap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5738/1027/files/geometry_angles_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/the_texas_chainsaw_massacre_the_beginning_2006_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8996ad7d-f7c1-4a47-9691-ca35894fa73a/how_did_dictatorship_start_ww2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16036691-962a-4fe6-a1db-4d421e0f5973/65707785536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/456d4e9b-3695-46d6-a3ab-461ae784e357/waretukelunosibalexipasez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcefae92-883f-43ff-88d1-3351f400e481/molecular_genetics_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff232b8-03aa-4f2f-97cc-1551df4be342/dragon_ball_z_shin_budokai_psp_rom_cool.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_off000098b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98B5 4936 bytes
SHA-256: 91dce9c1cc37c9a872c872467a5da4da0540076ad938ae1c831a2b2884e32878
font_01_sfnt_off0000a997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA997 10516 bytes
SHA-256: 8664d66674a091558baeb1c440fbdbc6783a085a711b3b2334962847dcd2f5d6

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