Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2af05a1c48448c…

MALICIOUS

PDF

34.1 KB Created: 2018-06-11 08:45:32 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 3909716252d0ecd2d0d763fd56dce723 SHA-1: a674775631b0b8b788c8aaaf4efa3485a2ea32d6 SHA-256: 8f2af05a1c48448c034e639b744c63946b00fe0854a4fe045fb5be598201f762
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 an external URI, both pointing to 'uncpbisdegree.com'. The ML classifier also flagged the PDF as malicious. The presence of a 'download button' heuristic suggests a social engineering lure to trick the user into downloading a file from these suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8409

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=war-of-honor-honor-harrington-series-book-10.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=war-of-honor-honor-harrington-series-book-10.pdfIn PDF document text
    • http://infodump.thefifthimperium.com/series/Harrington/In PDF document text
    • http://www.favoriteauthornotification.com/author_book_list.php?authorID=1312In PDF document text
    • http://riverside-resort.net/1/windows-7-configuration-answers-chapter-5.pdfIn PDF document text
    • http://riverside-resort.net/1/uss-franklin-d-roosevelt-reunion.pdfIn PDF document text
    • http://riverside-resort.net/1/vw-t4-workshop-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/wiring-diagram-toyota-ae101-1997.pdfIn PDF document text
    • http://uncpbisdegree.com/1/seiko-szzb14-watches-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-pcg-v505ec-laptops-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/when-santa-turned-green.pdfIn PDF document text
    • http://riverside-resort.net/1/vernier-motor-construction-diagram.pdfIn PDF document text
    • http://uncpbisdegree.com/1/standard-schedules-information-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sharp-training-answers.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/Honor_HarringtonIn PDF document text
    • https://en.wikipedia.org/wiki/Honor_Harrington_seriesIn PDF document text
    • https://www.barnesandnoble.com/w/ashes-of-victory-david-weber/1103275772In PDF document text
    • https://www.barnesandnoble.com/w/echoes-of-honor-limited-leatherbound-edition-david-weber/1127209046In PDF document text
    • http://www.baen.com/uncompromising-honor-earc.htmlIn PDF document text
    • http://www.baen.com/shadow-of-victory.htmlIn PDF document text
    • https://de.wikipedia.org/wiki/Honor_HarringtonIn 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%2fHonor_HarringtonIn PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/LongRunningBookSeriesIn PDF document text
    • https://www.fanfiction.net/crossovers/book/In PDF document text
    • https://www.fanfiction.net/book/In PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Series/PoirotIn PDF document text
    • http://marvel.com/comics/characters/1009165/avengersIn PDF document text
    • http://www.indiewire.com/gallery/new-tv-shows-fall-2017-2018-season-first-look-series/#In 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
    • http://hawaiifiveo.wikia.com/wiki/Hawaii_Five-O_In 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_off00004857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4857 10364 bytes
SHA-256: 763612c099beeb5445b9df138c45bbdaa464c3dce1b8f0be5b1db08e46a5c3f0
font_01_sfnt_off00006952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 7544 bytes
SHA-256: 035636a60eccd6ce3409f9312fe5b86cb3bf49cc1c94cb4fa5f681cbc754978d