Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d4455b21f915f8…

MALICIOUS

PDF

27.3 KB Created: 2018-06-11 09:14:49 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 2fbdfdc5ab24964b4a7331b28ec02456 SHA-1: 474bbe2a24f40d2616e30d57626731e34dc6d0d1 SHA-256: 28d4455b21f915f89c101d1e777e51c8d92b331225e8caafd80a57770f08ba0b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The ML classifier strongly flagged this PDF as malicious. The presence of external URIs pointing to download scripts, combined with a visual download button lure, indicates a likely attempt to trick the user into downloading a malicious file. The document body contains multiple URLs, including suspicious ones like 'uncpbisdegree.com', which are likely part of the lure or delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9667

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=skeleton-women-mingmei-yip.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=skeleton-women-mingmei-yip.pdfIn PDF document text
    • http://www.mingmeiyip.com/In PDF document text
    • http://www.historicalnovels.info/Asia.htmlIn PDF document text
    • http://www.passagestothepast.com/In PDF document text
    • http://riverside-resort.net/1/sistem-kerja-rem-cakram-pada-motor.pdfIn PDF document text
    • http://riverside-resort.net/1/the-black-box.pdfIn PDF document text
    • http://riverside-resort.net/1/the-wicked-bad.pdfIn PDF document text
    • http://riverside-resort.net/1/the-book-of-certainty-sufi-doctrine-of-faith-vision-and-gnosis-golden-palm.pdfIn PDF document text
    • http://riverside-resort.net/1/socalgas-complaints.pdfIn PDF document text
    • http://riverside-resort.net/1/termination-of-employment-letter-sample.pdfIn PDF document text
    • http://riverside-resort.net/1/trump-nih-funding.pdfIn PDF document text
    • http://riverside-resort.net/1/the-white-gryphon-valdemar-mage-wars-2-mercedes-lackey.pdfIn PDF document text
    • http://riverside-resort.net/1/springboard-senior-english-level-6-teacher-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-accounting-game.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_off0000324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324E 10076 bytes
SHA-256: 962a43d8e05f1ada3ab002135b8ecccc8d17e2d57560c432410de1921c5790e0
font_01_sfnt_off00005247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5247 6820 bytes
SHA-256: 1e13da25733090cc537ae97144873cf89ee651ade9835dd7fd35e9d2260abda1

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