Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24336790d1b6ccf…

MALICIOUS

PDF

48.0 KB Created: 2020-10-26 04:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 13cd81b79890b38828e0006c330caea6 SHA-1: 7319fd8006c632ee68e49f86183d9c079b33673a SHA-256: d24336790d1b6ccf57b284ed5c6285492ba343500796070c74691893fd7e0158
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One URL, 'https://cctraff.ru/strik?keyword=who+vs+whom+worksheet', is flagged as a known malicious redirector. The ML classifier strongly indicates maliciousness, and the document body contains garbled text alongside URLs, suggesting an attempt to obscure the malicious intent.

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://cctraff.ru/strik?keyword=who+vs+whom+worksheet In PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/loduvene.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/miranajegav.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/90913b096d8.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/b5d123.pdfIn PDF document text
    • https://lotozuxefad.weebly.com/uploads/1/3/4/3/134316708/tesomepan.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/dutotetiz_tazekimuz_neziseb.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/41cbe746-ff7c-4b74-bf8b-2cb7c9bd20a0/6221039369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046ef3f7-120e-4323-b78e-f4621d6bb724/33673163007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70dd25d3-626d-4161-b9c2-9ea83de6d139/fudokekipenozakofaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9afc3bb2-15eb-40ca-9f72-b6c1f099f371/ripapavovodewuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c5a455-bafa-4f8a-852d-f1055599aed1/dufakokut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c8de5f-7721-495e-868b-4de868798b5e/93362196236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfaf0006-3987-4201-879a-55453c79ee63/acpi_ifx0102_1_hp_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95712796-1575-466b-81a4-8effdd12801c/62198776372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7963fd-261f-4109-bf59-9a42fedce700/jupunimobijamuxer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50d8e14-e69b-427c-98fe-c09decbf3426/fexiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e537fb7-9eac-41c8-ac65-27b25c0c7108/nutikelerofob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c16a13-0212-4896-a33a-7810365d27e2/driver_drill_bits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d95bde19-5dbd-40a1-aa06-ce38b9ba1232/download_frozen_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1151c49d-f642-40a2-98cb-09d11bbe9f0b/89396348444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8882/1406/files/ohio_state_football_signed_recruits.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6310/7480/files/ind_as_115_icai.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7215/7349/files/gabriels_message_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6133/0591/files/caddx_nx_8_lcd_user_manual.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_off00007d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D53 4912 bytes
SHA-256: c4ad39bed528cee00a988864de5bab57c490aa37616800ab96f0a7187a501b7f
font_01_sfnt_off00008e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E00 10900 bytes
SHA-256: f9ea60e37daebff3819d565d164be0e7f9f678526420e86cface288e4be55ca5

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