PDF malware analysis — malicious · 04d9685d09cd46b2

MALICIOUS

PDF

27.1 KB Created: 2018-06-11 10:01:39 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)

MD5: 43797ebfb3259ab1a8575e8441d30326 SHA-1: 4b75a0ec6b9a42c8b904817728e4c2f433a6dec3 SHA-256: 04d9685d09cd46b2714c6efcd90b329175ec7261d03aee9e9d8ecceeb2ba216a

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was identified as malicious by an ML classifier and contains heuristics indicating it is a fake download lure designed for SEO poisoning. The document body and embedded URLs point to suspicious domains, specifically 'uncpbisdegree.com', which is likely hosting a malicious payload disguised as a study guide. No scripts were extracted, but the overall pattern suggests an attempt to trick the user into downloading and executing a secondary malicious file.

Machine Learning

Nyx PDF Classifier malicious score 0.9664

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=tomags-study-guide.pdf
- http://uncpbisdegree.com/download4.php?q=tomags-study-guide.pdf
- http://riverside-resort.net/1/springboard-grade-8-english-answers.pdf
- http://riverside-resort.net/1/summerhill-a-radical-approach-to-child-rearing-as-neill.pdf
- http://riverside-resort.net/1/sony-cmt-ep707-owners-manual.pdf
- http://riverside-resort.net/1/title-piping-down-the-valleys-wild.pdf
- http://riverside-resort.net/1/the-long-walk-home-kindle-edition-will-north.pdf
- http://riverside-resort.net/1/the-isle-of-man-geologists-association-guides.pdf
- http://riverside-resort.net/1/the-data-model-resource-book-universal-patterns-for-data-modeling-v-3.pdf
- http://riverside-resort.net/1/sullivan-statistics-informed-decisions-using-data-manual.pdf
- http://riverside-resort.net/1/til-divorce-do-us-part-a-christian-looks-at-divorce.pdf
- http://riverside-resort.net/1/the-ebay-book-essential-tips-for-buying-and-selling-on-ebay-co-uk.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000030b9.bin` `fca51c3910ae0937293eb467243673f37637e281f2c23b10f3eb548ca68ed106`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30B9	9976 bytes
`font_01_sfnt_off00005072.bin` `09a28e8d39c1adaebf11bc7501dd000c5934391e4390942c8fe12355769c369d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5072	7172 bytes

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