Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a238ead6b7ad37…

MALICIOUS

PDF

63.5 KB Created: 2020-10-28 12:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2fa6fa29cd59d101b634858dd1bc524b SHA-1: 3807fdccd4327e18b752cb521d1aad349cfabfba SHA-256: 52a238ead6b7ad37372cdf4837f57de5d5de44b69b29d2b2ef408d7bb0354bdd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://cctraff.ru/strik?keyword=super+smash+bros+ultimate+dlc+joker+release+date, which is presented in a context that mimics search results. The document's structure and the presence of numerous external links suggest a SEO poisoning or link farm attack pattern.

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://cctraff.ru/strik?keyword=super+smash+bros+ultimate+dlc+joker+release+date In PDF document text
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/6f6cdeb936c10.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/986224.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/88b1de066a87.pdfIn PDF document text
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/100f54b4356.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/jumivarigumopabexu.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/4733702.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/gakaxut.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/c8fa44.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/bimedorune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/859ff1e0-70b5-4a55-9c0b-470fb64a67a4/77604720159.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/basic_computer_knowledge_in_telugu_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0708a424-c51a-4f38-a7d2-69295c60aec7/national_educational_television_dirty_logo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/77551646458.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/mapa_metro_santiago_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/netizens_in_cyberspace_active_citizenship.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/losers_bracket_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07310ffa-b829-455e-b774-4a5780aff3dd/lobidenevaba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4904/9494/files/tukamuxumiwalikak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA798 5472 bytes
SHA-256: e170d9c99f7bdc8965005cb1611240da43fbbaca5858a88b46b0fe23ba0f83e0
font_01_sfnt_off0000ba2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2C 11848 bytes
SHA-256: 71d98f92d9fa13dd90403b040cf5f7bb5cd18ad6656655676a83add03a4ceafb
font_02_sfnt_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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