Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db198d249113055…

MALICIOUS

PDF

27.9 KB Created: 2018-06-11 08:27:16 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: fa487643461bfbce0c2de258d9a4f7f0 SHA-1: 41f4485ffe28aadd644b2ba70afe4f55bfaef708 SHA-256: 7db198d2491130555eb9640abb08a0a6bf1b5cfd979709f796674117374e7f40
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains associated with SEO spam and fake downloads, as indicated by the 'PDF_SEO_FAKE_DOWNLOAD' and 'PDF_SEO_PHP_GATEWAY_LINK_FARM' heuristics. The document body also contains these malicious URLs, suggesting an attempt to trick users into clicking them for purported downloads. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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=seiki-sc462tc-tvs-owners-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=seiki-sc462tc-tvs-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/who-invented-it.pdfIn PDF document text
    • http://uncpbisdegree.com/1/test-question-k-thru-8th.pdfIn PDF document text
    • http://uncpbisdegree.com/1/selected-stories-o-henry.pdfIn PDF document text
    • http://riverside-resort.net/1/what-is-the-10-day-green-smoothie-cleanse-jj-smith.pdfIn PDF document text
    • http://riverside-resort.net/1/windows-nt-microsoft-cluster-server.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solutions-manual-tulane.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-art-of-motherhood.pdfIn PDF document text
    • http://riverside-resort.net/1/very-british-problems.pdfIn PDF document text
    • http://riverside-resort.net/1/uss-mount-vernon-lsd-39.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stripping-her-defenses-ex-ops-2-jessie-lane.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

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_off00003036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3036 11000 bytes
SHA-256: 160bac25462570640ba09832202c13ca4f83e8a3e4d4ad4cde298f1b7c8171e4
font_01_sfnt_off000052d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52D2 7424 bytes
SHA-256: f98325072fc8066863e519fcfae39d79c3c473e8cc91204d9d0a7cd8b4a78f23

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