Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be5329c51178bff…

MALICIOUS

PDF

33.1 KB Created: 2018-06-11 08:18:37 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 1dcd2c90df517b1942c6794ed7542283 SHA-1: af38139c7efbc84f69246cdb41011a7fbadccf3b SHA-256: 6be5329c51178bff50302d2817d274fcdea0f959dc99d61c268f94bffdb5e375
102 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a fake 'free download' lure, specifically targeting users searching for 'tom jones oxford worlds classics'. The document body and embedded URLs point to suspicious domains designed to host malicious downloads. The primary malicious URLs are http://uncpbisdegree.com/download3.php?q=tom-jones-oxford-worlds-classics.pdf and http://uncpbisdegree.com/download4.php?q=tom-jones-oxford-worlds-classics.pdf, which are likely used to distribute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9340

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=tom-jones-oxford-worlds-classics.pdf
    • http://uncpbisdegree.com/download4.php?q=tom-jones-oxford-worlds-classics.pdf
    • http://www.bibme.org/
    • http://www.ljhammond.com/classics/cl3.htm
    • https://ipsum.im/
    • http://christianthinktank.com/bookabs.html
    • http://www.sciencemeetsreligion.org/resources/bibliography.html
    • http://www.stuartagency.com/client-list.html
    • http://www.oldmovieexhibition.com/
    • http://riverside-resort.net/1/the-pigeon-pair.pdf
    • http://riverside-resort.net/1/shopkins-the-ultimate-collectors-guide.pdf
    • http://riverside-resort.net/1/statistical-mechanics-mcquarrie-solutions-chapter-2.pdf
    • http://riverside-resort.net/1/the-science-of-trust-emotional-attunement-for-couples-john-m-gottman.pdf
    • http://riverside-resort.net/1/systems-understanding-aid-8th-edition-statement-of-cash-flows.pdf
    • http://riverside-resort.net/1/tb-woods-sw1-ac-inverter-manual.pdf
    • http://riverside-resort.net/1/the-lincoln-conspiracy-a-novel.pdf
    • http://riverside-resort.net/1/the-bremen-town-musicians.pdf
    • http://riverside-resort.net/1/toyota-sienna-electrical-diagram.pdf
    • http://riverside-resort.net/1/sony-cmt-nez50-owners-manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://en.wikipedia.org/wiki/University_of_Oxford
    • https://abcnews.go.com/entertainment
    • https://www.amazon.com/amazon-fashion/b?node=7141123011
    • https://www.telegraph.co.uk/opinion/
    • http://ancientworldonline.blogspot.com/
    • http://bmcr.brynmawr.edu/2017/
    • http://www.gutenberg.org/browse/authors/a
    • https://www.amazon.com/movies-tv-dvd-bluray/b?node=2625373011
    • https://www.rollingstone.com/music
    • https://es.wikipedia.org/wiki/Libro
    • http://www.openculture.com/free_ebooks
    • https://www.udc.es/biblioteca
    • http://www.lib.berkeley.edu/MRC/imagesafam.html
    • https://libraries.psu.edu/databases
    • https://www.psychologytoday.com/us/blog/inside-the-box/201402/thinking-outside-the-box-misguided-idea
    • 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.

FilenameKindSourceSize
font_00_sfnt_off00004649.bin
f71a4c27aeb92c62f49380fd09c0a124ef7da6b8c3bb402f3dfcaef46e805b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4649 10320 bytes
font_01_sfnt_off0000671f.bin
9954e824c433fe86f79a521ffabc447ecb942b9fc55eeeb1e71fec9dea653ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x671F 6852 bytes