Malicious PDF — malware analysis report

Static analysis result for SHA-256 7935692ca9fa6fb6…

MALICIOUS

PDF

52.6 KB Created: 2020-10-15 07:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ba6ad08fbce790a644eb3fb924d4ce8 SHA-1: fd20686aba868e4a67a5a1811d6505891c7a8900 SHA-256: 7935692ca9fa6fb66b8b4afd5b5712816889f863219bfba0f82af3676bb9d68d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many pointing to disposable hosting services, and one directly to a known malicious redirector. The document body is obfuscated but contains a lure related to 'Sky sports f1 tv guide 2020' to encourage clicks on these links. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms a high likelihood of user redirection to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?keyword=sky+sports+f1+tv+guide+2020 In PDF document text
    • https://site-1048488.mozfiles.com/files/1048488/fixerubatageju.pdfIn PDF document text
    • https://site-1043121.mozfiles.com/files/1043121/flame_photometer_service_manual.pdfIn PDF document text
    • https://site-1040218.mozfiles.com/files/1040218/tutabalewosavozun.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/30714912751.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/98467509938.pdfIn PDF document text
    • https://site-1039257.mozfiles.com/files/1039257/manual_oil_pump_for_sale.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/8b0498.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/luterefuxa_jexijepove_mugifuk.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/5876011.pdfIn PDF document text
    • https://site-1041922.mozfiles.com/files/1041922/93384510010.pdfIn PDF document text
    • https://site-1038970.mozfiles.com/files/1038970/3669221874.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/1/0431/4634/6658/files/texukopibonamatinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7035/7149/files/57882527829.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1829/5709/files/microprocessors_and_microcomputers_hardware_and_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98f7fec-11a5-48d3-bf6f-da4bfb461834/vozagojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb48457-cc46-4f24-90f5-c41b21318ffc/59616946954.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_off0000845d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x845D 5624 bytes
SHA-256: b1a0a2abfc902de945fd29d2aba3269cbe9cd9b8959de8468126079362bfa626
font_01_sfnt_off000097ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AD 14704 bytes
SHA-256: 3262c45de7ee20a633e98a2469110a63985c2023d6338980fa7036f9b04ab589

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