Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ef34abc23951ab…

MALICIOUS

PDF

52.0 KB Created: 2018-06-11 08:07:39 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: c342dbdac66083426170fc5efcec82bb SHA-1: da1d6292a52d8bdb75310084895596fc17432a1d SHA-256: 48ef34abc23951abeb03259c15b757bb12ee1674cccf9ca3dff66c8250fea77a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded URLs that masquerade as links to a Toshiba TV manual but actually point to a suspicious domain. The ML classifier flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, limiting the ability to determine the exact payload or execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9083

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=toshiba-regza-52hl167-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=toshiba-regza-52hl167-manual.pdfIn PDF document text
    • http://tv.manualsonline.com/manuals/mfg/toshiba/52hl167.htmlIn PDF document text
    • https://www.manualagent.com/toshiba/regza-52hl167/owners-manualIn PDF document text
    • http://www.manualsbase.com/manual/157941/flat_panel_television/toshiba/regza_52hl167/In PDF document text
    • http://drabbi.de/toshiba/regza/toshiba_regza_52hl167_manual.pdfIn PDF document text
    • http://static.highspeedbackbone.net/pdf/Toshiba-47HL167-Manual.pdfIn PDF document text
    • http://nevine.de/toshiba/regza/toshiba_regza_52hl167_manual.pdfIn PDF document text
    • https://www.manualagent.com/toshiba/regza-47hl167/owners-manualIn PDF document text
    • http://uncpbisdegree.com/1/spectrum-colors-and-shapes-flash-cards.pdfIn PDF document text
    • http://riverside-resort.net/1/vw-golf-jetta-service-and-repair-manual-virtual-lights.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-cracked-mirror-reflections-of-an-appalachian-son.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-xs-gf1332x-speakers-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/wascomat-w620-service-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/vhlcentral-supersite-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/smart-made-coupons.pdfIn PDF document text
    • http://riverside-resort.net/1/windows-server-2015-proxy-server-guide.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-fractalist-memoir-of-a-scientific-maverick-benoit-b-mandelbrot.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-repair-manual-hyundai-tucson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://support.toshiba.com/support/modelHome?freeText=2841547In PDF document text
    • https://support.toshiba.com/support/homeIn PDF document text
    • https://www.manualslib.com/products/Toshiba-Regza-52hl167-384111.htmlIn PDF document text
    • https://www.manualslib.com/brand/In PDF document text
    • https://www.manualslib.com/brand/toshiba/In PDF document text
    • https://www.manualslib.com/brand/toshiba/lcd-tv.htmlIn PDF document text
    • https://www.manualslib.com/manual/172567/Toshiba-Regza-42hl167.htmlIn PDF document text
    • https://www.manualslib.com/products/Toshiba-Regza-42hl167-384109.htmlIn PDF document text
    • https://www.newegg.com/Product/Product.aspx?Item=N82E16889253099In PDF document text
    • https://www.amazon.com/Toshiba-REGZA-52HL167-52-Inch-1080p/product-reviews/B000MY08GAIn 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.amazon.com/Toshiba-REGZA-52HL167-52-Inch-1080p/productIn 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_off000079ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 14152 bytes
SHA-256: ab1891c9e883d682e970ac9f6635ed4a04d313190994343051ffe1a205a46bf2
font_01_sfnt_off0000a5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B0 10356 bytes
SHA-256: 6b4a957e38ffad2bfad5d4ff07d0b37bbd00a5a84ae51a32a0fe7059c13b0d67