Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08c912abd6daca1…

MALICIOUS

PDF

27.3 KB Created: 2018-06-11 09:44:30 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: b29bcaf62bc5e535ebbc17afc7b90ffa SHA-1: 82f8c8312e1c429fb585534d685c27cc4a627439 SHA-256: d08c912abd6daca15d622d7828c9a69535a8eb2c8f95e012859041251a339881
130 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a high-confidence ML classifier flagging it as malicious. The document body and embedded links suggest a lure to download a PDF file from suspicious domains. The presence of a visual download button heuristic further supports the deceptive nature of the document. No scripts were extracted, limiting the analysis of further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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=waynes-tour-a-big-blokes-tour-de-france.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=waynes-tour-a-big-blokes-tour-de-france.pdfIn PDF document text
    • http://riverside-resort.net/1/workbook-mathematics-today.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sex-tourism-and-development-1st-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/x-men-magneto-testament-tpb-origin-graphic-novel-pb.pdfIn PDF document text
    • http://riverside-resort.net/1/wyman-gordon-brighton-mi.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-end-of-american-century.pdfIn PDF document text
    • http://riverside-resort.net/1/vision-pro-iaq-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/test-engineering-books.pdfIn PDF document text
    • http://riverside-resort.net/1/verizon-promo-code.pdfIn PDF document text
    • http://riverside-resort.net/1/wind-solar-electricity-a-practical-diy-guide-second-revised-edition.pdfIn PDF document text
    • http://uncpbisdegree.com/1/starting-and-operating-international-business-in-the-us-handbook.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_off00003076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3076 9992 bytes
SHA-256: fa9fec1218a72d5f45f5adae9631567244b311abb725f84307c2ada7145e4389
font_01_sfnt_off0000503c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x503C 7540 bytes
SHA-256: 45168a358f315c5194d43112e49b9a026583c1c435fd531be939517e097bc131