Malicious PDF — malware analysis report

Static analysis result for SHA-256 8959d0885fa96c02…

MALICIOUS

PDF

34.0 KB Created: 2018-06-11 09:35:43 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: aa026d8df7a566d1e0b8d38cf8ff78c4 SHA-1: c5812892f1bf2042ee3d870c53920015afeeafcc SHA-256: 8959d0885fa96c02847a4ded94de192e773f73549fc9e1fe8b230a32ec65597e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF is flagged as malicious by an ML classifier and uses SEO poisoning to appear as a free download for a popular comic. The embedded URLs, such as http://uncpbisdegree.com/download3.php?q=the-flash-comic-book-free.pdf, likely serve as a gateway to a malicious payload or exploit. The presence of cracked software links further supports a malicious intent, aiming to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8978

Heuristics 5

  • 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 link farm advertises cracked/pirated software medium PDF_CRACKED_SOFTWARE_LURE
    PDF contains many clickable links whose targets use cracked-software, keygen, serial-key, or warez vocabulary. These are SEO-spam lure documents that rank for software-piracy searches and route users to fake 'crack' download pages distributing potentially-unwanted programs, adware, or droppers. 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-flash-comic-book-free.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=the-flash-comic-book-free.pdfIn PDF document text
    • https://comicbookrealm.com/In PDF document text
    • http://www.stylinonline.com/comics.htmlIn PDF document text
    • http://www.stylinonline.com/shop-by-category.htmlIn PDF document text
    • https://comicbookinvest.com/In PDF document text
    • https://www.messforless.net/make-your-own-comic-book-free-printable-comic/In PDF document text
    • http://www.comiccollecting.org/In PDF document text
    • http://www.lorencollins.net/freecomic/In PDF document text
    • http://www.torontocomicbookshow.com/In PDF document text
    • http://www.diamondcomics.com/In PDF document text
    • http://uncpbisdegree.com/1/the-doctors-whos-who-the-story-behind-every-face-of-the-iconic-time-lord-dr-who.pdfIn PDF document text
    • http://uncpbisdegree.com/1/student-solutions-manual-for-winston39.pdfIn PDF document text
    • http://riverside-resort.net/1/when-beauty-tamed-the-beast.pdfIn PDF document text
    • http://riverside-resort.net/1/what-did-erin-brockovich-do.pdfIn PDF document text
    • http://riverside-resort.net/1/wassce-2015-inter-science-question-and-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/straight-talk-motorola-w418g.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-i-am-principle.pdfIn PDF document text
    • http://riverside-resort.net/1/water-resources-engineering-chin.pdfIn PDF document text
    • http://riverside-resort.net/1/world-cultures-a-global-mosaic-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/women-laws-and-judicial-pronouncements.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/Comic_bookIn PDF document text
    • https://screenrant.com/free-comic-book-day-2018-titles-list/In PDF document text
    • http://www.ign.com/articles/2018/04/25/everything-available-for-free-comic-book-day-2018In PDF document text
    • https://www.dccomics.com/comicsIn PDF document text
    • https://www.cbr.com/free-comic-book-day-2018-full-lineup-comics/In PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/ComicBook/DCRebirthIn PDF document text
    • https://www.ebay.com/gdsIn PDF document text
    • https://www.mycomicshop.com/advancedsearchIn PDF document text
    • http://www.cracked.com/blog/4-comic-book-fan-theories-way-cooler-than-comic-book/In PDF document text
    • http://www.cracked.com/blog/In PDF document text
    • http://www.cracked.com/humor-videos-extras.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://en.wikipedia.org/wiki/The_Flash_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_off0000484e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x484E 10868 bytes
SHA-256: 528a080c2a55b516cd8f0ab458000917d89ebcdc6420e68b4acf76eb01933425
font_01_sfnt_off00006a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A99 6896 bytes
SHA-256: 2923f49e2a6f5454897703926c5703c3edf3b5ac86eabbff4541d79c92922180