Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72f4a9ba2ac3617…

MALICIOUS

PDF

44.2 KB Created: 2020-10-24 18:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 723a05417fa225710e30aac89b6ef52e SHA-1: 21c6b3acb4c2dd74c04df205cfa1a45e8d885731 SHA-256: a72f4a9ba2ac36171816226698246dab3258389966cb830d48a4df41c32acd1c
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on services like Strikingly and Shopify. One of the primary links directs to a known malicious redirector, suggesting a link-farming or phishing campaign. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, including a malicious one, supports this assessment.

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/pify?keyword=internetworking+troubleshooting+handbook+pdf In PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/4762810.pdfIn PDF document text
    • https://xanuvomapimiv.weebly.com/uploads/1/3/4/3/134342034/1496470.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/9961a82d71f.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/a2af2cf1-2ac8-4384-b234-e2e2b9d3600f/xumexovixij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a05287-fbd2-4c79-9b58-c8d4de71f953/nilidivinibenoxutunuvig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d04f6aa-cac0-412a-8a32-19ede182f457/55011390107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e450213-b93c-405d-93b3-bd732e8748ca/vexosumupik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f44dcc-9151-42ac-9b0a-97dd0c614d0e/3354547194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6424/8470/files/fisiopatologia_da_osteoporose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9432/7974/files/torchlight_2_mods_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a81578-ea53-483b-bd94-49caf97bb810/11305402035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d37af06-49d9-4ef7-9da5-16c705f68b29/bedidufeloxuviladado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d53ca4e-508c-46a7-9f3d-bf212f82c721/32631968827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1b993a-4060-42e0-9432-334832c8f9dc/86565424940.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/bowixi.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/toronto_attractions_map.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/biological_wastewater_treatment_grady.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/mcgraw_hill_algebra_2_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7612/7394/files/reading_for_5th_grade_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4938/5126/files/1986_honda_trx_250_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8395/8945/files/crestwood_school_district_board_meeting.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_off00006e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4F 5536 bytes
SHA-256: b7a7cbd5018e01125560c2a21c57afd5fbaabe1f7b8cd5a6af450666f09eecc6
font_01_sfnt_off0000812e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812E 10096 bytes
SHA-256: 988d62dac54d5f460d886114f64eb8df5b09195ec97f6ac46f4be81d44121084

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