Malicious PDF — malware analysis report

Static analysis result for SHA-256 a550f51b59d27b51…

MALICIOUS

PDF

31.4 KB Created: 2018-06-11 08:33:31 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: cd59a978d5d4c4feaeabdd17ded8a6c7 SHA-1: a8ed79bec3c7f43ced4d8983e4abf908cd2b7dc6 SHA-256: a550f51b59d27b510794f3dae24f3dc2f78f19690bf504b7549bc5c92ae659aa
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded URLs that point to a domain commonly associated with malware distribution. The ML classifier flagged this PDF with high confidence, and the presence of a 'download' button lure further supports a malicious intent. The document body, though partially corrupted, suggests a lure related to a 'sony z1u manual', aiming to trick users into downloading a payload from the suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9426

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=sony-z1u-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sony-z1u-manual.pdfIn PDF document text
    • http://getmanual.com/In PDF document text
    • https://cydiadownloads.org/books/de1141f/the_hamilton_type_principle_in_fluid_dynamics_fundamentals_and_applications_to_magnetohydrodynamics_thermodynamics.pdfIn PDF document text
    • http://www.fullcompass.com/brand/SON_Sony/Replacement-Service-Parts.htmlIn PDF document text
    • http://www.fullcompass.com/brand/SON_Sony.htmlIn PDF document text
    • http://www.fullcompass.com/brand/SON_Sony/Accessories-Parts-Hardware.htmlIn PDF document text
    • https://www.videoonerepair.com/customer-reviews/In PDF document text
    • http://riverside-resort.net/1/workbook-8-2-the-nature-of-covalent-bonding.pdfIn PDF document text
    • http://uncpbisdegree.com/1/taiwan-yearbook-2004.pdfIn PDF document text
    • http://riverside-resort.net/1/valmet-service-manual-890i.pdfIn PDF document text
    • http://riverside-resort.net/1/us-history-regents-date-august-2013-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/what-are-you-looking-at.pdfIn PDF document text
    • http://uncpbisdegree.com/1/software-security-engineering-a-guide-for-project-managers.pdfIn PDF document text
    • http://riverside-resort.net/1/vans-shoes-job-application.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-complete-fairy-tales-oscar-wilde.pdfIn PDF document text
    • http://uncpbisdegree.com/1/tb-woods-e-trac-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/slosson-word-list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.manualslib.com/manual/748614/Sony-Hvr-Z1u.htmlIn PDF document text
    • https://www.manualslib.com/brand/In PDF document text
    • https://www.manualslib.com/brand/sony/In PDF document text
    • https://www.manualslib.com/brand/sony/camcorder.htmlIn PDF document text
    • https://www.manualslib.com/products/Sony-Hvr-Z1u-362199.htmlIn PDF document text
    • https://www.manualslib.com/manual/832188/Sony-Hvr-Z1j.htmlIn PDF document text
    • https://www.manualslib.com/products/Sony-Hvr-Z1j-3612092.htmlIn PDF document text
    • https://www.sony.com/all-electronicsIn PDF document text
    • http://www.projectorcentral.com/search.cfmIn 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://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FC8 10452 bytes
SHA-256: 391d02921eca758f0baf4513607c2005d608741c115030fd7f9c01ac53592347
font_01_sfnt_off000060f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 6908 bytes
SHA-256: 0419f61aab1c5eb1bbd89119afc180663aedea9f244639fc102477b63f4f9b84