Malicious PDF — malware analysis report

Static analysis result for SHA-256 7155834f4198bf2e…

MALICIOUS

PDF

72.5 KB Created: 2020-10-29 23:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 75dbae98e44e053b4355e72c22c54686 SHA-1: b5b55ad7294e522665387a86af9d24d01ff1c105 SHA-256: 7155834f4198bf2e56994588db9fb0a20e644f867a975475b590b8a762456ff2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain URLs that are part of a link farm designed to redirect users to potentially harmful sites. The presence of numerous external links, including one pointing to a malicious redirector, strongly suggests an attempt to lead users to malicious content.

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://gettraff.ru/aws?keyword=ap+world+history+unit+5+study+guide In PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/zerujenaxatukep.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://uploads.strikinglycdn.com/files/c0aab18a-6fc8-4c41-b5c5-6f0c2d46873c/lobibagixitinujosek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d31384-85df-40f8-9036-10330e90182f/zuwigineroji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3f6322-297d-4d0b-a2cc-28b854a0af8f/frackin_universe_frozen_wastes_walkt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b7a324-ab88-446a-9c44-53b558843248/2008050706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284032e6-5d86-4321-8118-bf32bb96c252/77481704896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6528/3238/files/futomiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199ec1a3-842c-45bb-aba2-2536f69a21bb/wajonetezubegejiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8750820e-d90f-4dd3-bc34-af0ea6d1d074/44720145451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b628ac8-6cca-4759-8050-ec09e6ec03bb/44015731037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3aec3cc-084f-4ba4-ae41-d54f895570cc/90922743485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c963d12-5c7c-4cc3-bb08-f32b01b489e9/kapufiwod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4332/1537/files/bw_m1_speaker_stand_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e83d1f-f659-4329-a130-cab8eaef5ce0/45395079190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ed60b4-f1bd-4f26-a2d5-37095480259c/85692483396.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000dae4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDAE4 23744 bytes
SHA-256: a9d7f55ffd422ec9463977dabed984712557db04144d2bdaf956312be2367355
font_00_sfnt_off00009612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9612 5200 bytes
SHA-256: 00f99cfbe5ff81576da70752775da3cec9a49f775162d535d66deac24b3359eb
font_01_sfnt_off0000a7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C5 2860 bytes
SHA-256: 791d32bacd64b51560d07e0823938a5c4c7c3c7ac53bc838d1399b758e1326f7
font_02_sfnt_off0000b3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 11420 bytes
SHA-256: 5270d50dfaf8ab8b720cb160a8dcedd33858ee001f0672c441384b6cc971b1d4
font_04_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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