Malicious PDF — malware analysis report

Static analysis result for SHA-256 46254f00537333a0…

MALICIOUS

PDF

35.1 KB Created: 2018-06-11 08:32:42 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: e2c6c6efd825fd1e21acf8a65b650472 SHA-1: ff567fd9b1e8153de96faac95a2d76b3033cc3b7 SHA-256: 46254f00537333a06fac20a23e81d0f0aed6973299feeda240b32e07b83176cd
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, including one pointing to 'uncpbisdegree.com/download3.php', suggesting a download lure. The ML classifier flagged this PDF as malicious with a high probability. The document body, though partially garbled, indicates it is related to a 'volkswagen transporter t4 syncro repair manual', which is likely a pretext to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9454

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=volkswagen-transporter-t4-syncro-repair-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=volkswagen-transporter-t4-syncro-repair-manual.pdfIn PDF document text
    • http://www.volksieworld.co.za/kombi.htmlIn PDF document text
    • http://www.camperinterior.co.uk/html/vw_camper_interior_books.htmlIn PDF document text
    • http://www.volksieworld.co.za/fleetline.htmlIn PDF document text
    • http://vwrack.com/In PDF document text
    • http://www.samstagsales.com/vwaudi2.htmIn PDF document text
    • http://vwts.ru/manuals.htmlIn PDF document text
    • http://www.autopartexport.com/PowerIn PDF document text
    • http://vwts.ru/vw_golf2_19e.htmlIn PDF document text
    • http://www.clubvw.org.au/oldart003In PDF document text
    • http://vnx.su/content/avto/vw/volkswagen.htmlIn PDF document text
    • http://www.clubvw.org.au/oldart009In PDF document text
    • http://abs-pump-module-repair-bosch-kelsey-hayes-vauxhall-vectra-b-uk.ecu-rc.com/keywords_abs.htmlIn PDF document text
    • http://avto-mechs.ru/sitemapIn PDF document text
    • https://1mbed.com/In PDF document text
    • http://riverside-resort.net/1/sencore-manuals-user-guide.pdfIn PDF document text
    • http://riverside-resort.net/1/the-scars-of-ambition-cumerian-unraveling-1-jason-letts.pdfIn PDF document text
    • http://riverside-resort.net/1/tiger-shrimp-tango-lp.pdfIn PDF document text
    • http://riverside-resort.net/1/sir-fartsalot-hunts-the-booger-kevin-bolger.pdfIn PDF document text
    • http://riverside-resort.net/1/sista-souljah-a-deeper-love-inside.pdfIn PDF document text
    • http://riverside-resort.net/1/the-great-commission-resurgence-fulfilling-god.pdfIn PDF document text
    • http://riverside-resort.net/1/the-true-story-of-the-jersey-boys-the-story-behind-frankie-valli-and-the-four-seasons.pdfIn PDF document text
    • http://riverside-resort.net/1/the-wings-of-the-dove-classic-fiction.pdfIn PDF document text
    • http://riverside-resort.net/1/the-terror-dream-fear-and-fantasy-in-post-9-11-america-susan-faludi.pdfIn PDF document text
    • http://riverside-resort.net/1/the-cube-board-game-instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/VolkswagenIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=RU_EN&a=http%3a%2f%2fvwts.ru%2fmanuals.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=RU_EN&a=http%3a%2f%2fvwts.ru%2fvw_golf2_19e.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=RU_EN&a=http%3a%2f%2fvnx.su%2fcontent%2favto%2fvw%2fvolkswagen.htmlIn PDF document text
    • https://de.wikipedia.org/wiki/VW_Passat_B4In PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=DE_EN&a=https%3a%2f%2fde.wikipedia.org%2fwiki%2fVW_Passat_B4In PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=NL_EN&a=http%3a%2f%2fabs-pump-module-repair-bosch-kelsey-hayes-vauxhall-vectra-b-uk.ecu-rc.com%2fkeywords_abs.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=RU_EN&a=http%3a%2f%2favto-mechs.ru%2fsitemapIn PDF document text
    • http://www.dictionary.com/e/s/word-of-the-year-list/In 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%2f1mbed.com%2fIn 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_off00004cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF7 10124 bytes
SHA-256: 0a7f0acba987424c15873a11679ac65cd5b7ccbad9ffc84b3b7683c72e8258d1
font_01_sfnt_off00006d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1F 7420 bytes
SHA-256: 4b473294f4179d31cf61ac9e189c0d131e7e3ae022735471676b51fd9a4dafeb