Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efd0c4a9c667074…

MALICIOUS

PDF

63.2 KB Created: 2020-10-26 08:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1fb79636a0b2a14e66ae1ad74063735f SHA-1: 99cf36f3afb71e582edf9179a2fc7d1dfa5e105a SHA-256: 2efd0c4a9c667074c478cfc7a1b06ea7cb7d1611532b4ea9455d4324e6e196aa
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 0.9991

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=schema+therapy+a+practitioner%2527+s+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f873c3813cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f9455d341995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5f92d050a5ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_5f92e37576916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f8874ff645f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5f94789a35ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5f95a3a032a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5f9295f44c75a.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/1/0428/3141/3415/files/dbs_update_service_employer_guide_-_gov.uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7616/9109/files/dinamicas_psicologicas_para_adolescentes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3886/6071/files/52949042327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2779/0496/files/tazufudujamepusapujabubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2586/6662/files/700_watt_power_supply_electricity_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b63ae61-4b1f-4ab3-9629-31c295c72960/fudazewinuriwigepugivub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a97ad3c-9099-42ee-9616-6dc621723cf4/72927007491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109c80f0-44d6-4f82-a217-626cd8204adf/kapijozoritefujagi.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/binomische_formeln_bungen_klasse_8.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/73342546319.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/save_smaller_file_size_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/nujotot.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/81430630056.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1721/4874/files/a_plastic_ocean_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8560/6296/files/google_play_store_installieren_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2446/5051/files/house_rent_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7597/4821/files/simac_il_gelataio_1600_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6419/9841/files/champions_league_soccer_games.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000d04b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD04B 18960 bytes
SHA-256: 97d027cee14f083292bfd7582b5731e4b0b169649f47aaa9f4c4243c2927cfd5
font_00_sfnt_off00008db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB0 3048 bytes
SHA-256: 5d09b80e865d82d3dad4db5920a4c63c3636ee70a7a2b3366e85caae004cabe9
font_01_sfnt_off00009887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9887 5692 bytes
SHA-256: bf0be6a5fe541be2a942e19a3be092aadb580c0bebcf50338193d460121f0c71
font_02_sfnt_off0000abc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC6 11404 bytes
SHA-256: 99125a49b02e27bffb3adbbcad960de7278ad15a5fcf87058129e9efb345e2b3

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