Malicious PDF — malware analysis report

Static analysis result for SHA-256 6268ffee9d1baa75…

MALICIOUS

PDF

28.8 KB Created: 2018-06-11 08:28:23 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 6fda35f9e39d6cd9b32662cecdd831cb SHA-1: bf3f1261494eb9f7207d06a1b3c0bab6f5eb6596 SHA-256: 6268ffee9d1baa750e6c8cd01c2d51088477170bf06d625a7e4e29c773695bf5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier as malicious. It contains embedded URLs that point to a domain known for distributing malware, specifically identified as a fake download lure through SEO poisoning. The document body also contains these malicious URLs, reinforcing the intent to trick the user into downloading a potentially harmful file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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.
  • 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=ttfn-ttyl-internet-girls-1-2-lauren-myracle.pdf
    • http://uncpbisdegree.com/download4.php?q=ttfn-ttyl-internet-girls-1-2-lauren-myracle.pdf
    • http://riverside-resort.net/1/sony-vpceb35fx-laptops-owners-manual.pdf
    • http://riverside-resort.net/1/time-out-1000-things-to-do-in-britain.pdf
    • http://riverside-resort.net/1/therapy-horses-horses-that-heal.pdf
    • http://riverside-resort.net/1/social-agenda-of-south-asia-2-vols.pdf
    • http://riverside-resort.net/1/the-daylight-gate-hammer.pdf
    • http://riverside-resort.net/1/typical-four-wire-diagram-for-utility-trailer.pdf
    • http://riverside-resort.net/1/social-software-engineering-development-and-collaboration-with-social-networking.pdf
    • http://riverside-resort.net/1/the-lady-and-the-law-western-romance.pdf
    • http://riverside-resort.net/1/technical-communication-mike-markel.pdf
    • http://riverside-resort.net/1/shalom-and-the-community-of-creation-an-indigenous-vision.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.ala.org/advocacy/bbooks/frequentlychallengedbooks/top10
    • http://mentalfloss.com/article/59059/10-twenty-first-century-bestsellers-people-tried-ban-and-why
    • http://www.ala.org/advocacy/bbooks/frequentlychallengedbooks/YAbooks
    • https://en.wikipedia.org/wiki/List_of_most_commonly_challenged_books_in_the_U.S
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409
    • https://go.microsoft.com/fwlink/?linkid=868922
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409
    • http://go.microsoft.com/fwlink/?LinkID=617297
    • https://en.wikipedia.org/wiki/Ttyl_
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035e6.bin
23e63fca4c8e9a8903b2aac2ab564f5b89143144a55cd7150a74b8a93bad8473
pdf-font-stream PDF embedded font (sfnt) at offset 0x35E6 10184 bytes
font_01_sfnt_off00005644.bin
a5130203ed8b7f418551099b7d9969b59fa4048c3278c8bfa62c2303931c7de4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5644 7396 bytes