Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a947c00571d565…

MALICIOUS

PDF

27.5 KB Created: 2018-06-11 08:50:49 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 05c4a5f532a41df60f93ceb9feb59cdc SHA-1: 793a751eb97afae2914bc72a38e1efc8f32fb45d SHA-256: b8a947c00571d5653c654230b6d12de18523a5e3c61f573f098c19d17495c9d9
130 Risk Score

Malware Insights

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

The PDF contains embedded links and a heuristic firing for a visual download button, suggesting a social engineering lure. The ML classifier flagged this PDF as malicious with high confidence. The primary malicious indicators are the external URIs pointing to potentially malicious download locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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-tao-of-inner-peace-diane-dreher.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-tao-of-inner-peace-diane-dreher.pdfIn PDF document text
    • http://www.tao-te-king.org/literaturweitere.htmIn PDF document text
    • http://www.sapphyr.net/smallgems/quotes-happiness-joy.htmIn PDF document text
    • http://www.pageinsider.com/In PDF document text
    • https://www.monnuage.fr/In PDF document text
    • http://riverside-resort.net/1/yugoslavia-ruin-the-bloody-lessons-of-nationalism.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manuals-for-panasonic-fax-machines.pdfIn PDF document text
    • http://uncpbisdegree.com/1/slam-dunk-vol-4.pdfIn PDF document text
    • http://uncpbisdegree.com/1/shameful-mia.pdfIn PDF document text
    • http://riverside-resort.net/1/vehicle-wrap-design-uk.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-end-of-wasp-season-alex-morrow-2-denise-mina.pdfIn PDF document text
    • http://riverside-resort.net/1/z3-lights-relay-diagram.pdfIn PDF document text
    • http://uncpbisdegree.com/1/strength-of-materials-by-singer-2nd-edition.pdfIn PDF document text
    • http://uncpbisdegree.com/1/tech-2-user-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/switch-outlet-wiring-diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=FR_EN&a=https%3a%2f%2fwww.monnuage.fr%2fIn 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_off00003439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3439 10132 bytes
SHA-256: ad3982e7a295bdf64e6515a2e3b975135f29f577e8e2accbb6c7aeab2f3b0947
font_01_sfnt_off00005494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5494 6304 bytes
SHA-256: 30e9443e4f7a9d2dd10b4583efa2526ba59c80c611918530d9c44ab1f9a4488d

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