Malicious PDF — malware analysis report

Static analysis result for SHA-256 7968b173b4233332…

MALICIOUS

PDF

68.7 KB Created: 2020-12-05 11:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b35724a84abf5f885f5cbe5ce947db28 SHA-1: 187c26eabb399fbac832438db35b741f3746bdcf SHA-256: 7968b173b4233332463dbaf100c1bab7c7aa43b6a8aa03b93650efeb3f1467ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://gettraff.ru/strik?utm_term=irs+form+8965+for+2018'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is 'https://uploads.strikinglycdn.com/files/d8549c05-5e5d-47df-b05e-77e985facf93/the_cask_of_amontillado_selection_test_answer_key.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'Irs form 8965 for 2018', suggesting a lure for tax-related phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=irs+form+8965+for+2018 In PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8742796.pdfIn PDF document text
    • https://dorinupunariwuw.weebly.com/uploads/1/3/4/7/134716439/9059490.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/6276513.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/sawewi.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/d8549c05-5e5d-47df-b05e-77e985facf93/the_cask_of_amontillado_selection_test_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11cad733-282e-41c8-8c27-611a6905c1ce/the_hiding_place_chapter_1-2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60979e15-ed1a-424c-bbc7-0c299e3b01d8/ka_stroud_engineering_mathematics_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eaa1d87-f5b8-4a73-bf74-0b36236db3e1/retofibejafaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714d350b-8883-46fa-b87f-76c7f752968f/30338498454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9b2c27-ccd8-4b80-a032-1d455f5e4c87/15855087803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d32149-b6bf-4378-ba7c-16b52f2f7737/manual_boost_controller_install_on_twin_turbo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c406a6-2263-46e6-882f-b19edab924ce/dojulivinodebobopokoxesuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810def16-7365-4120-9bc6-e38ec494773f/mitutoyo_sj-210_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76b9fd6-2453-4974-a184-def011d2680f/sovuwobesozipebesutafefis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44993da6-5a1c-4f55-8f23-c6d20adbe1fd/42627059165.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_off0000d032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD032 5560 bytes
SHA-256: 2b51078fd07259c109618c3d1f01c3d2300123f4c2a8c3e06997b6a26daed111
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 10400 bytes
SHA-256: 41a6caf3d5ba0015f04cdd87401822fdf45c22286aa640ed7e676a47497f894a

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