Malicious PDF — malware analysis report

Static analysis result for SHA-256 418cc6474916cc48…

MALICIOUS

PDF

64.3 KB Created: 2020-11-07 08:14:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5dc14ead77cc78f53121da60c21af941 SHA-1: 9bf56f025bb36b3de33cea96fa31800347bcdf2f SHA-256: 418cc6474916cc4814410424e932d096157fa2ff416f8447b2066666ff15f2e3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, likely intended to manipulate search engine rankings or direct users to malicious content. The ML classifier also strongly indicated maliciousness.

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://traffmen.ru/aws?keyword=pokemon+mega+power+rom+hack In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8b9f8cdb904.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/6f514b77-1493-43c8-8101-6d476a1e17f1/the_most_dangerous_game_short_story_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6cc166-873f-4e5e-bd0c-d7d7253a8987/kujojixeduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1df6720-0f77-4bd0-887f-6433f36ac884/64928377951.pdfIn PDF document text
    • https://pubosepiko.files.wordpress.com/2020/11/xubesusogolugabizodovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539ffc7b-885f-433f-87f3-51d97320080e/37632260340.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/46213041593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d23adfde-15a1-41d9-a641-0542bd550438/mobile_app_startup_business_plan_template.pdfIn PDF document text
    • https://zejifumeg.files.wordpress.com/2020/11/32333620827.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/fufaxemevapivix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65189847-dc2b-45f6-b936-2dab1c94c616/cardboard_wine_boxes_wholesale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf66c821-8737-44e2-bf22-293e62e9b205/zisutaziposoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc5ee56-0e0d-4135-9421-58e1c2cce787/naxomuki.pdfIn PDF document text
    • https://bitemifexem.files.wordpress.com/2020/11/steel_panthers_world_at_war_download.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0022a20d-bed7-4dd7-8877-6224831a8f26/the_one_kiera_cass_free_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD4 5292 bytes
SHA-256: 675c9632269e928b0e60ecb6792890d1a92deaf930372d89a1c5969c958c758b
font_01_sfnt_off0000adc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC7 13696 bytes
SHA-256: 26698dd8d79d3e051e47f8a2770ef2c1f9575df6dd9da148b1a924e87fcc3fbf
font_02_sfnt_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 17436 bytes
SHA-256: 3e6632e7100ff3fe52b7d4f19c22401f4dc6396c43ff26fb400dc3344704f579