Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4c39c437ea6c14…

MALICIOUS

PDF

49.9 KB Created: 2020-10-04 16:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 746b360add31ae75e611883b6b403b23 SHA-1: 685cbead30f8c075fec55435ec944424b3110bc4 SHA-256: 8b4c39c437ea6c1474691ddd1965dca306ebdb294e0ffc92909307a7e6e8832e
184 Risk Score

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=mutant+genetic+gladiators+hack+apk In PDF document text
    • http://files.ltclanna.org/uploads/1/3/1/3/131379382/jixatege.pdfIn PDF document text
    • http://files.stoughtonfinearts.org/uploads/1/3/0/7/130775561/dd2bc820.pdfIn PDF document text
    • http://fubivare.skateteamindy.com/uploads/1/3/2/3/132303093/f6d1d9cb9afd4be.pdfIn PDF document text
    • http://files.nicoleadriennephotography.com/uploads/1/3/0/7/130775288/9451895.pdfIn PDF document text
    • http://files.littlehandsandfeetdoula.com/uploads/1/3/1/6/131636689/zapoxu.pdfIn PDF document text
    • https://site-1041615.mozfiles.com/files/1041615/bunanajufibuxeminukano.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/78210876518.pdfIn PDF document text
    • https://site-1040125.mozfiles.com/files/1040125/kunaje.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/1/0432/2852/8808/files/sammy_sosa_hall_of_fame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/kugou_vip_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8757/5705/files/big_buck_hunter_pro_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ab22eb-377c-4da3-9d17-ace30d306b2f/31817295967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88a067b-e802-4c3a-ab5c-d07527c7de57/mabewamamuzimil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07544cab-ad5d-4906-ac66-340f486a18c9/93558444674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f29f51-048b-44a5-9d9e-3812a4539a86/mezavar.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_off00006d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D65 5404 bytes
SHA-256: a3cc3e94967609713ed21f4c34ac57a58ae668165daee8d9ba12d2ee8a6c2756
font_01_sfnt_off00007fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCB 10376 bytes
SHA-256: ef2804eb70a5231d544ff8d5844200da2b0b38cba08a32580f6c641f89576584
font_02_sfnt_off0000a381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA381 16160 bytes
SHA-256: 53c3ec829963ec5a0af1bff4be2d724acb9959b277e5253d769434e6be684fe1

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