Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50223350bcf5e52…

MALICIOUS

PDF

47.0 KB Created: 2020-10-08 01:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cbd5ca8cb60c47571570df80c8bd1319 SHA-1: dd9416058f48f6a5f998e1bd7fa4e993baa85fb1 SHA-256: d50223350bcf5e526840a89019796e7eb785e74f55f1eead5e80d37eeb341941
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that this document is designed to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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/strik?keyword=human+physiology+an+integrated+appro In PDF document text
    • http://files.phoenixsymphonychorus.org/uploads/1/3/0/8/130873718/wupejapomakebuv.pdfIn PDF document text
    • http://files.lovecyprusdogrescue.co.uk/uploads/1/3/1/1/131164125/didujevegenime.pdfIn PDF document text
    • http://files.ornamentsofexpression.com/uploads/1/3/1/4/131455883/vojosa.pdfIn PDF document text
    • http://files.vidarthegame.com/uploads/1/3/0/8/130874023/zexokef.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/japezuvul.pdfIn PDF document text
    • https://site-1038583.mozfiles.com/files/1038583/vevujiloviru.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/tozidareporale.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/motalupunebewu.pdfIn PDF document text
    • https://site-1040313.mozfiles.com/files/1040313/6847473149.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/1/0440/2269/4046/files/ryuusei_no_gemini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8837/0077/files/light_levels_minecraft_f3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8172/7640/files/aimbot_apk_download_roblox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8971/4080/files/beat_your_boss_4_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fca80c-1aaa-4982-be40-b94478eb2749/80842423366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e94729-ceb0-438e-8860-6c882b3fd0a6/xakosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac553a2-cc0b-40e1-8234-0c881d943456/52908290581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fd22b3-900c-477b-b3c8-4a32e1b8cf46/10702119372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941d4e54-bd3b-4696-99a6-10f18b120dd5/87773592399.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_off00006f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F27 5436 bytes
SHA-256: 7a26814f028493cbd5ee941c5ca2be387e5e40e253303d5c2d881370afd1810b
font_01_sfnt_off00008179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8179 14280 bytes
SHA-256: 9b2c84c8715fc8686924eeba7f97a3bd42a568773372f6abb28e1c77c6985469

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