Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bb8d9fc87bc172…

MALICIOUS

PDF

60.7 KB Created: 2020-10-30 06:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9056cabad60a24d11eabd57a79b17f8 SHA-1: 3eaec41bf0b63c2f6cb1515f7a1784fcb41ff5ff SHA-256: 32bb8d9fc87bc172883f48d0d89d83ba0147ec5dc85bd9d72587cf98337e66b1
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common tactic for SEO link farms and malicious redirection. One prominent URL, 'https://cctraff.ru/pify?keyword=clarke+county+jail+osceola+iowa', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it by appearing as a search result. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=clarke+county+jail+osceola+iowa In PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/tinimuzaworowi.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/tegizufibu_miwub_dekuseni.pdfIn PDF document text
    • https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/fodujiwef.pdfIn PDF document text
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/wanojakakoris_geropuxuxemuxuw_fokezumavi_gawurupafamiwis.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/6060815.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/ligole/pepipikulonidolifoz.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/fake_gps_joystick_and_routes_go_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/types_of_bearings_and_their_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e980cadc-771a-42ae-a352-54a04fb36559/fleck_5600_water_softener_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8691cd5-5f03-4e6e-9bd3-9acfb904edf1/xenokubufetogojijejila.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/use_of_articles_a_an_the_in_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/41718453367.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/11326199346.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/adobe_reader_portable_free_download.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_off0000ad12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD12 5032 bytes
SHA-256: 629a6d6ecc2fff0c385f658b90211126377251a77c78678ed03dbd6492ed9c09
font_01_sfnt_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 11156 bytes
SHA-256: d642d4a6dcf4e6a301f5ffe691aac095e0b72037ce40c375f72e4795a343555d

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