Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4bc8bb975763c4…

MALICIOUS

PDF

52.4 KB Created: 2018-06-11 08:20:54 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 4f4825d25e056ca3acf05a2c3f10e38a SHA-1: 4d95a4be200e8b6e476595ea097a08007d34c321 SHA-256: 8d4bc8bb975763c48eabc74be1007ce97b6e912650927602c88fb55f856438b6
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.5427

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://uncpbisdegree.com/download3.php?q=working-solutions-property-management.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=working-solutions-property-management.pdfIn PDF document text
    • http://www.cmacommunities.com/In PDF document text
    • https://auth.cmacommunities.com/login.aspxIn PDF document text
    • http://www.cmacommunities.com/homeowners/In PDF document text
    • http://www.cmacommunities.com/contact-us/In PDF document text
    • http://www.cmacommunities.com/real-estate-pros/In PDF document text
    • http://www.cmacommunities.com/about-cma/In PDF document text
    • http://www.almamater.tv/reads-online/working-solutions-property-management.pdfIn PDF document text
    • http://smshow.de/working/solutions/working_solutions_property_management.pdfIn PDF document text
    • http://psdesign-co.com/reads-online/working-solutions-property-management.pdfIn PDF document text
    • http://birdissa.com/file/working-solutions-property-management.pdfIn PDF document text
    • http://www.sharenchat.com/reads-online/working-solutions-property-management.pdfIn PDF document text
    • http://cuxcom.de/working/solutions/working_solutions_property_management.pdfIn PDF document text
    • http://www.codexlockoutstudios.com/doc/pdf/archive/working-solutions-property-management.pdfIn PDF document text
    • http://hspace.de/working/solutions/working_solutions_property_management.pdfIn PDF document text
    • http://riverside-resort.net/1/ymca-flyer-template.pdfIn PDF document text
    • http://uncpbisdegree.com/1/software-engineering-6th-edition-ian-sommerville.pdfIn PDF document text
    • http://uncpbisdegree.com/1/thai-garden-style.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stealing-the-mystic-lamb-true-story-of-worlds-most-coveted-masterpiece-noah-charney.pdfIn PDF document text
    • http://uncpbisdegree.com/1/supersite-answer-key-leccion-12.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-feast-of-goat-mario-vargas-llosa.pdfIn PDF document text
    • http://uncpbisdegree.com/1/student-data-sheet-molecular-data-answer-sheet.pdfIn PDF document text
    • http://riverside-resort.net/1/women-development-workers-implementing-rural-credit-programmes-in-bangladesh.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solar-sails-a-novel-approach-to-interplanetary-travel.pdfIn PDF document text
    • http://uncpbisdegree.com/1/template-for-temporary-registration-for-texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.facebook.com/WorkingSolutionsIncIn PDF document text
    • https://www.facebook.com/solutionspropertymanagementfl/In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://www.facebook.com/solutionspropertymanagementflIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8294 13360 bytes
SHA-256: 6b1cfa314fda009cd1041da8386264d6856f711fa854a9df970cc90f7b650ee9
font_01_sfnt_off0000abcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABCF 8520 bytes
SHA-256: 1d160493fa2ea46869171442ec7951a231d9344b5bed839abe3f18aeaaa4d639