Malicious PDF — malware analysis report

Static analysis result for SHA-256 154d64799629f43f…

MALICIOUS

PDF

32.5 KB Created: 2018-06-11 09:32:15 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 5bfd6905146b36356138efb79b9d681e SHA-1: 7fd1b3e3b60a7630ab3f0a727fc413b68dfcece5 SHA-256: 154d64799629f43f3c966f81fb2cbd48d508b3eea004b0cdabfc91cd5663b528
102 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by an ML classifier and heuristic rules. It contains embedded URLs that point to a domain associated with fake download lures, indicating an SEO poisoning attempt. The document body, though partially garbled, contains references to the malicious URLs and search terms, reinforcing the lure.

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=sugar-cookie-murder.pdf
    • http://uncpbisdegree.com/download4.php?q=sugar-cookie-murder.pdf
    • http://www.joannefluke.com/hannah-swensen-series/apple-turnover-murder/
    • http://www.joannefluke.com/hannah-swensen-series/
    • http://www.liveinthenow.com/article/the-chilling-link-between-antidepressants-and-murder
    • https://chriskresser.com/when-your-normal-blood-sugar-isnt-normal-part-1/
    • http://riverside-resort.net/1/wireless-charging-research.pdf
    • http://uncpbisdegree.com/1/supermicro-5015b-mt-owners-manual.pdf
    • http://riverside-resort.net/1/wida-and-common-core-planning-template.pdf
    • http://uncpbisdegree.com/1/the-individual-and-society.pdf
    • http://riverside-resort.net/1/vocabulary-for-achievement-seventh-grade-teachers-edition.pdf
    • http://riverside-resort.net/1/who-made-white-people.pdf
    • http://uncpbisdegree.com/1/supercar-design-sketches.pdf
    • http://riverside-resort.net/1/user-manuals-cerberus-pyrotronics.pdf
    • http://uncpbisdegree.com/1/the-hillary-step-from-everest-to-the-south-pole.pdf
    • http://riverside-resort.net/1/volvo-user-guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://en.wikipedia.org/wiki/Sugar_Minott
    • https://en.wikipedia.org/wiki/Calavera
    • https://www.barnesandnoble.com/w/raspberry-danish-murder-joanne-fluke/1126477634
    • https://whatscookingamerica.net/Glossary/C.htm
    • http://www.nola.com/healthy-eating/2018/05/sugar_honey_sweeteners_which_s.html
    • https://www.thesun.co.uk/news/6273577/jamie-olivers-6-times-sugar-limit/
    • http://www.nola.com/sugarbowl/index.ssf/2017/12/sugar_bowl_2018_where_to_eat_h.html
    • https://www.vanityfair.com/hollywood/2018/01/versace-murder-lee-miglin-andrew-cunanan
    • https://www.theguardian.com/lifeandstyle/2014/jan/13/sugar-how-to-give-up-11-easy-steps
    • https://www.thesun.co.uk/news/4866250/alzheimers-disease-study-sugar-link/
    • http://www.grubstreet.com/2015/06/untitled-whitney-chocolate-chip-cookie.html
    • http://www.itv.com/news/2017-10-04/army-sergeant-tried-to-murder-wife-by-removing-vital-parachute-parts-court-told/
    • https://www.cbsnews.com/live/
    • http://www.dailymail.co.uk/femail/article-2516510/The-honey-diet-Drop-dress-size-party-season-having-spoonful-honey-bed--following-delicious-recipes.html
    • https://www.mirror.co.uk/news/uk-news/pizza-hut-slammed-over-milkshake-12476038
    • 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_off000044e8.bin
bbe503326dd8d25ab9d29dda51459189a2548dde71e926cff11a1472c2fd878f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44E8 9836 bytes
font_01_sfnt_off00006438.bin
d016497d03e1ac349c648fb0b888a381a19f57b2163a255279ceca93a3dee692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6438 7148 bytes

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