Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4b1def8371594b…

MALICIOUS

PDF

45.9 KB Created: 2018-06-11 08:23:47 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: c4d7cc9a0de31a30bf1f6076ee0ba667 SHA-1: 0c69d8b7ab15ff79d6a22e93da683b2bc0385d13 SHA-256: 9a4b1def8371594b7d615b308c3d4f91eec711033d7f2fb22b6343c6c22b4785
130 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that point to potentially malicious download locations. The ML classifier flagged this PDF as malicious, and the presence of a visual download button lure further supports the attack pattern. The document body, though partially garbled, includes references to download URLs, reinforcing the intent to trick the user into downloading a file. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8020

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=serial-networked-field-instrumentation.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=serial-networked-field-instrumentation.pdfIn PDF document text
    • http://reaparprindesign.ro/serial-networked-field-instrumentation.pdfIn PDF document text
    • http://www.pottytrainingbedwetting.com/reads-online/serial-networked-field-instrumentation.pdfIn PDF document text
    • http://totalpeople.solutions/serial/networked/serial_networked_field_instrumentation.pdfIn PDF document text
    • http://genomeofficial.com/reads-online/serial-networked-field-instrumentation.pdfIn PDF document text
    • http://www.bunlacasa.ro/serial-networked-field-instrumentation.pdfIn PDF document text
    • http://riverside-resort.net/1/something-wonky-this-way-comes.pdfIn PDF document text
    • http://riverside-resort.net/1/stanford-electrical-engineering-phd.pdfIn PDF document text
    • http://riverside-resort.net/1/short-essay-on-winter-season-in-hindi.pdfIn PDF document text
    • http://riverside-resort.net/1/talcum-powder.pdfIn PDF document text
    • http://riverside-resort.net/1/tsc-huskee-riding-mower-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/stationary-engineer-exam-sample-questions-california.pdfIn PDF document text
    • http://riverside-resort.net/1/tale-of-two-cities.pdfIn PDF document text
    • http://riverside-resort.net/1/startup-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/the-best-storytelling-book-ever.pdfIn PDF document text
    • http://riverside-resort.net/1/stanford-research-systems-ds335-user-guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.worldcat.org/title/serial-networked-field-instrumentation/oclc/31971016In PDF document text
    • https://www.biblio.com/9780471953265In PDF document text
    • https://www.biblio.com/usedbooksearch.bibIn PDF document text
    • https://www.amazon.com/Serial-Networked-Field-Instrumentation-Jordan/dp/0471953261In PDF document text
    • https://www.amazon.com/books-used-books-textbooks/b?ie=UTF8&node=283155In PDF document text
    • https://www.amazon.com/Computers-Technology-Books/b?ie=UTF8&node=5In PDF document text
    • https://www.amazon.com/Hardware-Computers-Internet-Books/b?ie=UTF8&node=549652In PDF document text
    • https://www.researchgate.net/publication/234814347_Serial_Networked_Field_InstrumentationIn PDF document text
    • http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471953261.htmlIn PDF document text
    • http://www.wiley.com/WileyCDA/Section/id-350566.htmlIn PDF document text
    • https://www.barnesandnoble.com/w/serial-networked-field-instrumentation-j-r-jordan/1101188798In PDF document text
    • https://www.walmart.com/ip/Serial-Networked-Field-Instrumentation/634946342In PDF document text
    • https://www.walmart.com/cp/8901905In PDF document text
    • https://www.walmart.com/cp/8291132In 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://www.researchgate.net/publication/234814347_SerialIn PDF document text
    • https://www.barnesandnoble.com/w/serial-networked-fieldIn 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_off00006967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6967 14716 bytes
SHA-256: 72b9fec4953eed89f60f316a22b735ec251337b19a80a36314d5c86240dadae4
font_01_sfnt_off000096c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C3 7324 bytes
SHA-256: 211c3a4a5f87912ea3a452b0f6c74d19d5fef11efd6164e25b13d04aa938fa04