Malicious PDF — malware analysis report

Static analysis result for SHA-256 1804750c0a7ec6f8…

MALICIOUS

PDF

28.9 KB Created: 2018-06-11 08:32:42 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 5613148000d3905c3813edb2740a067f SHA-1: e15f837b674eeff7efca34ec66dd1b22634da9a4 SHA-256: 1804750c0a7ec6f899045856e0428de8be13506e2d32c47703b3589636a5518e
102 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a fake download lure, specifically using SEO poisoning to trick users into downloading a file. The embedded URLs point to a domain that is likely hosting the malicious payload. The document body, though partially garbled, contains references to the download URLs and the purported academic paper title, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

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=structured-surfaces-as-optical-metamaterials-1st-edition.pdf
    • http://uncpbisdegree.com/download4.php?q=structured-surfaces-as-optical-metamaterials-1st-edition.pdf
    • http://www.ncsli.org/i/c/a/MEC.aspx
    • http://www.cityu.edu.hk/see/seminar.htm
    • http://uncpbisdegree.com/1/the-darkest-hour-swordmage-trilogy-2-martin-f-hengst.pdf
    • http://uncpbisdegree.com/1/sevenoaks-and-tonbridge-explorer-maps-os-explorer-map.pdf
    • http://uncpbisdegree.com/1/sony-vgn-ux230p-laptops-owners-manual.pdf
    • http://uncpbisdegree.com/1/solution-manual-for-introduction-to-managerial-accounting-5th-edition-bybrewer.pdf
    • http://uncpbisdegree.com/1/the-atlantis-world-the-origin-mystery-book-3-unabridged.pdf
    • http://uncpbisdegree.com/1/summit-r18ff-refrigerators-owners-manual.pdf
    • http://riverside-resort.net/1/unit-6-connecting-algebra-and-geometry-review.pdf
    • http://uncpbisdegree.com/1/solution-focused-therapy-strengths.pdf
    • http://riverside-resort.net/1/www-nbp-com-pk.pdf
    • http://uncpbisdegree.com/1/shakespeare-apos-s-freedom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dx.doi.org/
    • https://pt.wikipedia.org/wiki/Livro_digital
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=PT_EN&a=https%3a%2f%2fpt.wikipedia.org%2fwiki%2fLivro_digital
    • https://en.wikipedia.org/wiki/Oled
    • 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_off0000377f.bin
863e9e8762f4a24b123359c3a0e2b0ee0d07510145cffdc6a55bf653bd3f8152
pdf-font-stream PDF embedded font (sfnt) at offset 0x377F 10460 bytes
font_01_sfnt_off000058a4.bin
cd8ff66cb106658622e077bb252d2fad0c0913e4fa33fe495560674c6d7486ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x58A4 6816 bytes