Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5f6a1fd5ce857f…

MALICIOUS

PDF

28.5 KB Created: 2018-06-11 08:52:19 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: e2fc3cc74834c0af5490bf7661357f61 SHA-1: d0dde059e05b0a57f1e5420c6f706ba05023bb0a SHA-256: ae5f6a1fd5ce857f085c759dd10da2276cda28f8d46e008ab8cbedd202f076c5
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains multiple suspicious URLs, with the primary one being http://uncpbisdegree.com/download3.php?q=skagen-384xsbb1-watches-owners-manual.pdf. The document body, though partially garbled, suggests a lure related to a watch manual, and the presence of a 'download' button heuristic further supports a malicious download attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9605

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=skagen-384xsbb1-watches-owners-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=skagen-384xsbb1-watches-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/the-spirit-of-zen-a-way-of-life-work-and-art-in-the-far-east-wisdom-of-the-east.pdfIn PDF document text
    • http://riverside-resort.net/1/subaru-2005-legacy-gt-problems.pdfIn PDF document text
    • http://riverside-resort.net/1/statistics-for-engineers-and-scientists-navidi-3rd-edition-solutions-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-vpceb45fx-laptops-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/the-betrothal.pdfIn PDF document text
    • http://riverside-resort.net/1/solutions-manual-medical-instrumentation-application-design-download.pdfIn PDF document text
    • http://riverside-resort.net/1/the-old-patagonian-express.pdfIn PDF document text
    • http://riverside-resort.net/1/the-cambridge-companion-to-marx-cambridge-companions-to-philosophy.pdfIn PDF document text
    • http://riverside-resort.net/1/the-world-of-tiers-volume-one.pdfIn PDF document text
    • http://riverside-resort.net/1/sports-tourism-pahse-2-memo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000031ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EC 10352 bytes
SHA-256: 6971c8323e0eed6439326f16d85b05c2f80c9354c7d29a8fa770b89db1f5d409
font_01_sfnt_off000052cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52CD 8320 bytes
SHA-256: a66f7982beea068a74d0a903ee04203af130a6c43cb2112c2882b70de7a26d42