Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9602a13aaf8318…

MALICIOUS

PDF

28.3 KB Created: 2018-06-11 09:59:55 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 352e0a4ee8309aa57a0c6050dc4d9c76 SHA-1: 987b30255c84f67211b66eb336338bcf30134779 SHA-256: bd9602a13aaf8318876d62a73253aba7cf63fff25c30eeedd917b41b44cc6b67
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple embedded URLs, with a high-confidence ML classifier flagging it as malicious. The document body and heuristics indicate a lure to download a PDF, specifically referencing 'sony vgp xl1b2 owners manual' and pointing to suspicious URLs like unc pbisdegree.com. The presence of external URIs and the ML classification strongly suggest this PDF is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

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-vgp-xl1b2-owners-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sony-vgp-xl1b2-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/you-shall-be-my-witnesses.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-burgess-animal-book-for-children-thornton-w.pdfIn PDF document text
    • http://uncpbisdegree.com/1/skin-color-genetics.pdfIn PDF document text
    • http://uncpbisdegree.com/1/system-dynamics-2nd-ed-solution.pdfIn PDF document text
    • http://riverside-resort.net/1/what-causes-lighting.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-quadrunner-220.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stanley-fatmax-450-amp-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/slobozhanshchina-almanakh-literatoriv-sumshchini.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stanford-cancer-center.pdfIn PDF document text
    • http://uncpbisdegree.com/1/ssc-answer-key-cgl-2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forum.imgburn.com/index.php?/topic/6232-the-imgburn-settings/In PDF document text
    • http://forum.imgburn.com/index.php?/forum/1-general/In PDF document text
    • http://forum.imgburn.com/index.php?/forum/4-guides/In 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_off000032b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B6 10404 bytes
SHA-256: 7eed0e6637ac7eca2e9b0b9d2ae1c53c3557bcff6c67b58b99e35276de2aa9c4
font_01_sfnt_off000053c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53C0 7724 bytes
SHA-256: d7ee3b58aebbd45d1b2c6c46ce3ea381bf2be11d4b23189fd148417e034e48ec

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