Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94430ca9ea3113d…

MALICIOUS

PDF

29.0 KB Created: 2018-06-11 09:23:19 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 29628acf2cd4d508997f5ea2d45145d9 SHA-1: c2bd36d3906d888b5f23f22f3be6d02cfdb4afb2 SHA-256: a94430ca9ea3113d1cb574426b5ecbed5969447137fe9d8e3b5a233b28548f27
130 Risk Score

Malware Insights

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

The PDF contains embedded URLs and document body text that mimic a search result for a 'sixth edition physics giancoli solutions manual'. The primary malicious indicators are the external URIs pointing to uncpbisdegree.com, which are likely intended to deliver a payload disguised as the requested PDF. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

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=sixth-edition-physics-giancoli-solutions-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sixth-edition-physics-giancoli-solutions-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-corolla-2e-engine-diagram.pdfIn PDF document text
    • http://riverside-resort.net/1/strongest-comic-book-characters-ever.pdfIn PDF document text
    • http://riverside-resort.net/1/system-analysis-and-design-galgotia.pdfIn PDF document text
    • http://riverside-resort.net/1/the-gleams-reflections-on-quranic-wisdom-and-spirituality-the-risale-i-nur-collection.pdfIn PDF document text
    • http://riverside-resort.net/1/the-buffettology-workbook-value-investing-the-warren-buffett-way.pdfIn PDF document text
    • http://riverside-resort.net/1/sub-zero-water-purifier-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/systemax-s95-desktops-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/theoretical-foundations-of-health-education-and-health-promotion.pdfIn PDF document text
    • http://riverside-resort.net/1/spiderman-comic-book-dress.pdfIn PDF document text
    • http://riverside-resort.net/1/teacher-guide-of-summit-1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.loot.co.za/index/html/index4054.htmlIn PDF document text
    • http://www.loot.co.za/index/html/index3385.htmlIn 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://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3667 10488 bytes
SHA-256: 6f9fb14a6c740ccd3f62b31b7fd1208bdccb8298617e6bb61647f2ea77c7ca13
font_01_sfnt_off000057a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57A6 7236 bytes
SHA-256: 03eeeffe57902d189a430489079ec76b00bef3ff37bb935f34f52c1679c8a1e4

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