Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46b54ff99e843c4…

MALICIOUS

PDF

29.0 KB Created: 2018-06-11 09:05:08 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: b852d202d0e1cd945474ecd9ac52f617 SHA-1: 7d134d44f16f43bc9bf262728bd497049853bfcd SHA-256: d46b54ff99e843c4cfe92b87a5548ecbeaa2b092e27d3aed21dbe864b7f9d4b9
130 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and a heuristic firing for an external URI, indicating an attempt to redirect the user to download content. The ML classifier flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure suggests a phishing or social engineering attempt to trick the user into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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=sylvain-reynard-gabriel-s-inferno-vol-03-seduzione-ed-estasi.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sylvain-reynard-gabriel-s-inferno-vol-03-seduzione-ed-estasi.pdfIn PDF document text
    • http://www.incipitario.com/index.htmlIn PDF document text
    • http://riverside-resort.net/1/the-students-guide-to-successful-project-teams.pdfIn PDF document text
    • http://riverside-resort.net/1/service-manual-2005-kia-rio.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-tcm-150-voice-recorders-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-dsc-h5-service-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/triumphlearning-common-core-coach-english-grade-4.pdfIn PDF document text
    • http://riverside-resort.net/1/stirling-moss-scrapbook-1955.pdfIn PDF document text
    • http://riverside-resort.net/1/the-virtuoso-teacher-improve-your-teaching.pdfIn PDF document text
    • http://riverside-resort.net/1/uconnect-web-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/teachers-copy-of-holt-mcdougal-algebra-1.pdfIn PDF document text
    • http://riverside-resort.net/1/timeless-design-cars.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=IT_EN&a=http%3a%2f%2fwww.incipitario.com%2findex.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_off0000345c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x345C 10668 bytes
SHA-256: b413e58aed4444ebbe94e464ff9fccc0b7accc143ddf46992d66deb449bd1939
font_01_sfnt_off0000560f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x560F 7944 bytes
SHA-256: 6b5da5922257366240c92cd602184060cff619b11ef404e96e85988b35907863

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