Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0dc491796dbf95…

MALICIOUS

PDF

50.9 KB Created: 2018-06-11 08:42:00 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 28676e3a199e18a242b2482a5fa9e6b1 SHA-1: 5861898942e4f3eb4e8ca61ecd3a7d61bb5dcbcf SHA-256: fa0dc491796dbf95e8dc9c97be3bc5f17a57c29ffa522e9d94713a00b1f66f04
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs that redirect to pages offering a file named 'tesccc-geometry-answers.pdf'. The presence of a 'ML_NYX_PDF_MALICIOUS' heuristic firing and the 'SE_DOWNLOAD_BUTTON' heuristic suggest that this PDF is designed to trick users into downloading a malicious payload. The document body, though partially garbled, contains references to the URLs and appears to be a lure for educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7480

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=tesccc-geometry-answers.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=tesccc-geometry-answers.pdfIn PDF document text
    • http://1645pacific.com/online/tesccc-geometry-answer-key.pdfIn PDF document text
    • http://emprendenauta.com/online/geometry-answer-key-tesccc.pdfIn PDF document text
    • http://gekade.de/tesccc/geometry/tesccc_geometry_answer_key.pdfIn PDF document text
    • http://cheshmehsara.com/online/geometry-tesccc-unit-5-lesson-1-answers.pdfIn PDF document text
    • http://bjerld.de/tesccc/geometry/tesccc_geometry_answer_key_unit_2.pdfIn PDF document text
    • http://wowidi.de/tesccc/geometry/tesccc_geometry_answer_key_unit_8.pdfIn PDF document text
    • http://buycos.de/tesccc/geometry/tesccc_geometry_unit_2_answer_key.pdfIn PDF document text
    • http://habahe.de/tesccc/geometry/tesccc_geometry_answer_key_2018.pdfIn PDF document text
    • http://www.throodalookingglass.com/ge/hs/geometry_hs_mathematics_tesccc_answer_sheet.pdfIn PDF document text
    • http://jonasp.de/tesccc/geometry/tesccc_geometry_2018_answer_key_unit_11.pdfIn PDF document text
    • http://copanestlepurelife.com/online/tesccc-geometry-answer-key.pdfIn PDF document text
    • http://uncpbisdegree.com/1/skyrim-official-strategy-guide-torrent.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-daily-telegraph-big-book-of-quick-crosswords-13-bk-13.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-black-horse-westerns.pdfIn PDF document text
    • http://uncpbisdegree.com/1/terrestrial-biomes-concept-mapping.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-for-hitachi-ue-30.pdfIn PDF document text
    • http://riverside-resort.net/1/walls-travels-along-the-barricades-marcello-di-cintio.pdfIn PDF document text
    • http://riverside-resort.net/1/visiting-card-design-template-photoshop.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-electroherbalism-frequency-lists.pdfIn PDF document text
    • http://riverside-resort.net/1/wetland-ecology-principles-and-conservation.pdfIn PDF document text
    • http://uncpbisdegree.com/1/skull-study-guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.huffingtonpost.com/teach-plus/five-fun-and-free-ways-to_b_11660850.htmlIn 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://769693.r.bat.bing.com/?ld=d3NujPRho-75YRbMYDa0r5rjVUCUztdj3OQGuKBlsp9ODzcEPfMEE4DIbG186nD0TIfReQ6GPwb7x99EIzNcndGyUWKMCP9vMR-uymKnPBrXJUHfhpNPJvD5kgrKwiPG-je0D30RtY0BNFOfOEA9wYHD6Gea7eD6sK2m1BplWVn5H48Gml&u=https%3a%2f%2fwww.ixl.com%2f%3fpartner%3dbing%26adGroup%3dgeometry%26campaign%3d1676%26msclkid%3d%7bmsclkid%7d%26utm_source%3dbing%26utm_medium%3dcpc%26utm_campaign%3dSearch%2520-%2520Math%2520Terms%2520-%2520Phrase%2520-%2520US%26utm_term%3dgeometry%2520answers%26utm_content%3dgeometryIn 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_off00007b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 13848 bytes
SHA-256: 8379fa044773f19e348a9b51517790a9cee4eaf773494b48c45836c85019ed3e
font_01_sfnt_off0000a5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A2 8888 bytes
SHA-256: 74f13b5855a82ec969d1cbd03f900d947b7f955b22a5b8a4e52e22d6c0866130

Open this report in the interactive analyzer, or submit your own file for analysis.