Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb85b69ab92ec17…

MALICIOUS

PDF

45.4 KB Created: 2020-11-09 01:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b4c81e8abba32bfa328755a4d80821ec SHA-1: 8aa88f6d85d4e27147c83d87ac52802b9b589cbc SHA-256: bcb85b69ab92ec172b3ad3407feaff073044d66df35c686ba68e5c6fb64516ca
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://cctraff.ru/123?keyword=left+finger+names+in+hand'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, including 'https://s3.amazonaws.com/tezofuretejom/wetafopetixijesipotuv.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting an attempt to direct users to malicious infrastructure.

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/123?keyword=left+finger+names+in+hand In PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/liguwunoteg.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/xeseb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/wetafopetixijesipotuv.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/list_of_african_countries_and_their_capital_cities.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/nanusakumatumek.pdfIn PDF document text
    • https://gomites309456149.files.wordpress.com/2020/11/14531476054.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/tv_guide_athens_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/jerakuke.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/pujas.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/punuvus.pdfIn PDF document text
    • https://vinutolaxuw.files.wordpress.com/2020/11/jurassic_world_alive_apk_mod_unlimited_money.pdfIn PDF document text
    • https://wadagoxipox.files.wordpress.com/2020/11/tolosokodedeweraxezat.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_off000074c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C3 5232 bytes
SHA-256: 57bfad2604d9b17252530b97edebd6d7ef0c0ceb9c6083aa36128cbf3a0f758f
font_01_sfnt_off0000866c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866C 10128 bytes
SHA-256: d0cd5b16e4874a12f836b3a504f3ce9dce23bdb109495f24ae0bc04491cbf608

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