Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d489602653eef25…

MALICIOUS

PDF

28.1 KB Created: 2018-06-11 08:33:00 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a8c437a85bc9923ca5d7a19678d5b83f SHA-1: 09e3c51d7fd006623ab83dd7418b9a29ad844747 SHA-256: 4d489602653eef253b04744d599cd33b14d84c184c01ae4f8ab8097b2e02e5d4
130 Risk Score

Malware Insights

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

The PDF document contains a visual download button lure and embeds external URIs pointing to potentially malicious PDF files. The ML classifier flagged this PDF with high confidence, suggesting malicious intent. The primary attack pattern involves tricking the user into downloading a file from the suspicious domain 'uncpbisdegree.com'. No scripts were extracted from this sample, limiting further analysis of its execution behavior.

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=successful-manager39s-handbook-chapters.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=successful-manager39s-handbook-chapters.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-arts-of-the-hausa.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stock-watson-econometrics-solutions-even.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-biosphere-1st-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/world-bank-group39s-travel-per-diem-rates-mtv-per-diem-usd.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-dsc-wx60-digital-cameras-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-higher-taste-a-guide-to-gourmet-vegetarian-cooking-and-a-karma-free-diet.pdfIn PDF document text
    • http://riverside-resort.net/1/your-chinese-roots-the-overseas-chinese-story.pdfIn PDF document text
    • http://riverside-resort.net/1/university-of-michigan-cancer-center.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-daily-adventures-of-mixerman.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solutions-manual-options-futures-other-derivatives.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_off000031d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D5 10520 bytes
SHA-256: 2322b1975905bdd9989dccb54a93401327d4f6f2783c14e76cc7e631a9436821
font_01_sfnt_off00005303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5303 7896 bytes
SHA-256: 15603d5e1513817ec6d0edabb5bff645f096649fb57184faf5305240cda6382e

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