Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffbd11828081e13…

MALICIOUS

PDF

34.3 KB Created: 2018-06-11 08:21:29 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 93321794bcabf818efd02d7e053d2151 SHA-1: b57117dec98f879963a96893563866afbcc656d3 SHA-256: 5ffbd11828081e13fcbe0bdfefdc3fa8553a0dd7d0370c0a0423589f6bb9cb94
102 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and heuristics as a fake 'free download' lure. It contains embedded URLs pointing to a domain that appears to be involved in distributing malicious content. The document body, though partially corrupted, contains references to these download URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9454

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=the-best-in-bridalwear-design-the-best-in-design.pdf
    • http://uncpbisdegree.com/download4.php?q=the-best-in-bridalwear-design-the-best-in-design.pdf
    • http://allaboutevebridalwear.com/
    • http://www.timelessbridalwear.ie/6-dress-silhouettes-what-suits-your-shape/
    • http://www.timelessbridalwear.ie/category/uncategorized/
    • https://sarahlouisebridal.co.uk/
    • http://www.robynroberts.co.za/
    • https://opuscouture.co.uk/
    • http://stewartparvin.com/
    • http://www.bellissimaweddings.co.uk/
    • https://opuscouture.co.uk/bridal-designers/
    • http://www.weddingsinsurrey.co.uk/wedding-fairs-in-surrey/
    • http://www.bridalslips.co.uk/
    • http://www.jewpro.co.uk/
    • http://www.totallyspaintravel.com/2015/05/08/best-shopping-in-spain/
    • https://www.hitched.com.au/wedding-venues/glengariff-historic-estate_1055.htm
    • https://www.hitched.co.za/wedding-venues/hudsons_729.htm
    • http://www.newbeginningslondon.co.uk/
    • http://www.williamgee.co.uk/
    • http://www.optimamagazine.co.uk/
    • http://www.anfieldagency.co.uk/
    • http://www.marigoldevents.com/
    • http://www.annapolissite.com/shopping.htm
    • http://www.littlewhitebooks.co.uk/wedding-fairs
    • http://www.apparelsearch.com/america.htm
    • http://uncpbisdegree.com/1/solution-manual-of-nuclear-physics-by-krane.pdf
    • http://uncpbisdegree.com/1/systems-understanding-aid-8th-edition-purchase-journal.pdf
    • http://riverside-resort.net/1/us-army-performance-verification-of-individual-water-purifiers-nsf-protocol-p248.pdf
    • http://riverside-resort.net/1/vermeer-605e-baler-manual.pdf
    • http://uncpbisdegree.com/1/sperry-kids-sneaker-owners-manual.pdf
    • http://uncpbisdegree.com/1/tanjavur-brhadisvara-an-architectural-study-1st-edition.pdf
    • http://riverside-resort.net/1/wine-a-cultural-history.pdf
    • http://riverside-resort.net/1/woodmizer-lt40-hd-operators-manual.pdf
    • http://riverside-resort.net/1/why-johnny-cant-come-home.pdf
    • http://riverside-resort.net/1/vons-batteries.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://www.hitched.co.uk/wedding-planning/bridalwear-articles/unusual-wedding-dresses_1094.htm
    • https://www.hitched.co.uk/giftlist/
    • 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_off000049e7.bin
6a1ab49aa7255182dd662f302e37a750616825337e3afa6c0d23b3d8e28bc78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E7 10392 bytes
font_01_sfnt_off00006ae9.bin
9c3fbf4ed1caae51dc047cc9d9c4465ed30316a4dbafd62b3481896834edc1ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE9 7220 bytes

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