Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22e6fc889b44fd9…

MALICIOUS

PDF

28.0 KB Created: 2018-06-11 08:17:03 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: ce40f594788248bf8276977cb700bcde SHA-1: 957b3f290bcb06583280c32c3a295f9b6dd651f0 SHA-256: c22e6fc889b44fd9e8b15fdf9faa852b5e7cc44f89287c23ff572a4ea42be4f6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by an ML classifier and exhibits characteristics of SEO-poisoning, specifically a fake download lure. The document body contains embedded URLs that point to a PHP gateway, likely serving as a distribution point for malicious content. The presence of these URLs and the SEO spam heuristic strongly suggest an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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=the-silver-chain-unbreakable-trilogy-1-primula-bond.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-silver-chain-unbreakable-trilogy-1-primula-bond.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-churchills.pdfIn PDF document text
    • http://riverside-resort.net/1/verizon-rezound-4g-lte-getting-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/wiring-diagram-power-window-monte-carlo.pdfIn PDF document text
    • http://riverside-resort.net/1/why-are-car-seat-belts-designed-to-stretch-somewhat-in-a-collision.pdfIn PDF document text
    • http://riverside-resort.net/1/write-for-results.pdfIn PDF document text
    • http://riverside-resort.net/1/world-talk-common-errors-in-english-from-a-to-z.pdfIn PDF document text
    • http://riverside-resort.net/1/when-should-i-take-the-gre.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-bantam-crossword-dictionary.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-comeback-kids-cincinnati-reds-2010-championship-season-1st-edition.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-black-flower-a-novel-of-civil-war-howard-bahr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.onelook.com/pm/In PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/ThePowerOfLoveIn 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_off00003410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3410 9784 bytes
SHA-256: fb5af265be685a73940fe826932b5d967596a67528fb6270b03ff59a03f44411
font_01_sfnt_off0000533a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x533A 7524 bytes
SHA-256: a3bf98dd28ffe602954f65460fb6d334661d496d516778fa9bedf5d91e591550

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