Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb42f32abce2003…

MALICIOUS

PDF

27.8 KB Created: 2018-06-11 08:52:40 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: d8eae28dc353e79f108dd99bcede0ef7 SHA-1: 60eca15fe4be65c3d5a80b7c9943b398cdd5bacf SHA-256: abb42f32abce2003826bfdd91ce0d184d3aeb47b05bb7f3f438201328b9b4751
130 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains embedded URIs pointing to suspicious domains, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports the lure-based attack pattern. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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=structural-analysis-by-aslam-kassimali-software.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=structural-analysis-by-aslam-kassimali-software.pdfIn PDF document text
    • http://riverside-resort.net/1/south-asia-apos-s-weak-states-understanding-the-regional-insecu.pdfIn PDF document text
    • http://riverside-resort.net/1/time-warner-1056b01-remote-codes.pdfIn PDF document text
    • http://riverside-resort.net/1/ugly-electric-motors-and-controls-book.pdfIn PDF document text
    • http://riverside-resort.net/1/suzuki-motorcycles-aftermarket-parts-user-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/sentry-ltb3p-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/ufs-postgraduate-prospectus.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-corolla-service-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/smacna-manual-roof-details.pdfIn PDF document text
    • http://riverside-resort.net/1/the-greater-magickal-angels-instant-access-to-133-angelic-powers.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-corolla-nze124-owners-manual.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_off00003220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3220 10560 bytes
SHA-256: 38ae97a893c4a2cbda226cae731ce69e92f51ab17020b921819782a4985b8c4b
font_01_sfnt_off0000537a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x537A 7228 bytes
SHA-256: 4cddd98974b9cb8f9919786a2abbe0ec76e773c3d704e998e54e4eb8729b93c7

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