Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba724aba4a9c3b6…

MALICIOUS

PDF

47.1 KB Created: 2018-06-11 09:15:46 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 2f2360c50d2a1c49ceebbe6d077c2305 SHA-1: 9178b0609ccbccf8567a8a27808771ca0cf54a2b SHA-256: bba724aba4a9c3b6762df52e2a4e94c99cf8d0b5c0fb0403857d9278b6679d29
130 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF contains embedded URLs and a heuristic firing for a visual download button, suggesting a social engineering lure. The document body, though partially garbled, includes references to a PDF file and URLs that appear to be download links. The ML classifier also flagged the PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5841

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=suranjan-chakraverti-bholeshwar-naths-cases-and-materials-on-code-of-civil-pro.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=suranjan-chakraverti-bholeshwar-naths-cases-and-materials-on-code-of-civil-pro.pdfIn PDF document text
    • http://www.filmywap.tv/reads-online/suranjan-chakraverti-bholeshwar-naths-cases-and-materials-on-code-of-civil-pro.pdfIn PDF document text
    • http://destul.de/suranjan/chakraverti/suranjan_chakraverti_bholeshwar_naths_cases_and_materials_on_code_of_civil_pro.pdfIn PDF document text
    • http://www.netprocon.com/suranjan/suranjan_chakraverti_bholeshwar_naths_cases_and_materials_on_code_of_civil_pro.pdfIn PDF document text
    • http://genews.de/suranjan/chakraverti/suranjan_chakraverti_bholeshwar_naths_cases_and_materials_on_code_of_civil_pro.pdfIn PDF document text
    • http://riekko.de/suranjan/chakraverti/suranjan_chakraverti_bholeshwar_naths_cases_and_materials_on_code_of_civil_pro.pdfIn PDF document text
    • http://kasupg.de/suranjan/chakraverti/suranjan_chakraverti_bholeshwar_naths_cases_and_materials_on_code_of_civil_pro.pdfIn PDF document text
    • http://ekmtop.de/suranjan/chakraverti/suranjan_chakraverti_bholeshwar_naths_cases_and_materials_on_code_of_civil_pro.pdfIn PDF document text
    • http://fuppel.de/suranjan/chakraverti/suranjan_chakraverti_and_bholeshwar_naths_cases_and_materials_on_code_of_civil_procedure_3_vols_5t.pdfIn PDF document text
    • http://downloadgamespcfree.com/archive/doc/pdf/9-12-business-and-it-6417-answers.pdfIn PDF document text
    • http://bjerld.de/taking/the/taking_the_knocks.pdfIn PDF document text
    • http://gbjena.de/pengujian/transmisi/pengujian_transmisi_manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/symbolism-of-the-ark-universal-symbolism-of-the-receptacle-of-divine-immanence.pdfIn PDF document text
    • http://riverside-resort.net/1/workplace-conflict-resolution-strategies.pdfIn PDF document text
    • http://riverside-resort.net/1/user-guide-perkin-elmer-lambda-ez-201.pdfIn PDF document text
    • http://uncpbisdegree.com/1/taxation-for-decision-makers-solution-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/unit-conversion-worksheet-with-answer-key.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-contemporary-keyboardist-stylistic-etudes-with-cd-and-midi-disk.pdfIn PDF document text
    • http://uncpbisdegree.com/1/ssc-multitasking-question-paper-2012-with-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/svp-dv-8530-camcorders-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/studien-uber-stomatare-transpiration.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-volvo-fh-euro-5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://117.211.185.35.bc.googleusercontent.com/dl~3254/suranjan/chakraverti_3254/suranjan~chakraverti~bholeshwar~naths~cases~and~materials~on~code~of~civil~pro.pdfIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In 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_off00006d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 13952 bytes
SHA-256: 91fde7796b2875d086db5f95d514e65ba4e338f9f36c34c87d3e685ac3e0f6a8
font_01_sfnt_off0000987a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x987A 8712 bytes
SHA-256: 1d36f3cd180ddbaa8ee4fd28a041a30d3a1d9d3f591c9086c356e54dd1a4a448