Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea46f3535cd3e28…

MALICIOUS

PDF

54.7 KB Created: 2020-11-08 15:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aaab41dfdea843dea0bd2bf89fd77a55 SHA-1: 8df61c2da2c2eec34c54dc26269088d1d22b5b6d SHA-256: 9ea46f3535cd3e28db6f3ebba462c489575ef53307e04487a08cfdcf2f0a0d08
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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/123?keyword=blank+pdf+year+calendar+for+2020+and+2021 In PDF document text
    • https://jesebumu.weebly.com/uploads/1/3/4/6/134617302/posupawabofoju-kizavijizapi-kejol-ladufijudi.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/d841bc907.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/giviparof.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/ledigupe.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://s3.amazonaws.com/megelugik/voxewazokamozo.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/showbox_official_site_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf124d40-a822-4da3-89c0-1f99c054ad26/fojomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1634be63-7bb2-4402-8971-d77e38503e3e/avatar_kyoshi_book.pdfIn PDF document text
    • https://sakazedeg.files.wordpress.com/2020/11/estructuras_de_la_mente_howard_gardner.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/56960983394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62aa1311-c7b4-4026-9f13-54b7d721ecd4/xesigupadowobawuduv.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/montgomery_ward_sewing_machine_serial_numbers.pdfIn PDF document text
    • https://volokal.files.wordpress.com/2020/11/75688070297.pdfIn PDF document text
    • https://levorinoxuw.files.wordpress.com/2020/11/rede_e-tec_brasil_profuncionarioifsu.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009bd6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9BD6 21040 bytes
SHA-256: e87125022cb08cef51f23574f24faf0baa6fb5bfd62842e8ed9190fb68d42619
font_00_sfnt_off000066ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EA 5172 bytes
SHA-256: 933697f274fc1b00d4d8421b291860b43d486f51206301d0ec1c168edf4d4dfc
font_01_sfnt_off00007894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7894 10244 bytes
SHA-256: 427a1eb404ff9e0f38b60084c479969da5d85caf0885c815cd0b0901a2ca0ac8
font_03_sfnt_off0000bf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF37 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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