Malicious PDF — malware analysis report

Static analysis result for SHA-256 067b1e7650f376ab…

MALICIOUS

PDF

33.8 KB Created: 2018-06-11 09:58:51 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 091b68aaffca3eaea87be50dd9728fa0 SHA-1: b2ea7f775a557c3abd87c87c04b6307bd0a914c5 SHA-256: 067b1e7650f376ab429c78584d6ad4578e18c7ed92b16f6768ab8103ce297369
102 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and a specific heuristic for being a fake 'free download' SEO-poisoning document. It contains links to `uncpbisdegree.com` which are presented as download links for a car manual, but are likely gateways to malicious payloads. The document body contains obfuscated text and URLs, further indicating a malicious intent to deceive the user into downloading a file.

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=vw-polo-94-99-manual.pdf
    • http://uncpbisdegree.com/download4.php?q=vw-polo-94-99-manual.pdf
    • http://www.automart.co.za/cars/vw-polo-vivo/gauteng/
    • http://www.rossvw.com/vw/
    • http://www.oldclassiccar.co.uk/modernads_make/vw.htm
    • http://www.rossvw.com/harlequin/
    • http://greencarsite.co.uk/low-emissions-cars/
    • http://vaglinks.com/
    • https://www.wheels24.co.za/NewModels/Volkswagen_Polo/volkswagen-launches-all-new-2018-polo-in-sa-prices-details-and-more-20180124
    • http://www.autopartexport.com/Brake
    • http://www.freedomcontracts.com/
    • http://www.birgersbilligebilboeger.dk/haynes-vaerkstedsboger-og-lign/biler/
    • http://uncpbisdegree.com/1/suzuki-baleno-cluster-wiring.pdf
    • http://uncpbisdegree.com/1/teac-r-2-user-guide.pdf
    • http://riverside-resort.net/1/xtremepapers-past-papers-business-studies.pdf
    • http://riverside-resort.net/1/wedding-card-template-free-vintage.pdf
    • http://uncpbisdegree.com/1/staar-master-reading-answer-key.pdf
    • http://uncpbisdegree.com/1/st-james-encyclopedia-of-popular-culture-5-volume-set.pdf
    • http://riverside-resort.net/1/us-history-guided-activity-8-3-answers.pdf
    • http://riverside-resort.net/1/vocabulary-review-the-periodic-table-answers.pdf
    • http://riverside-resort.net/1/universal-farmliner-530-dtc-workshop-manual.pdf
    • http://uncpbisdegree.com/1/ssc-higher-secondary-level-exam-2018-answer-key.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://en.wikipedia.org/wiki/Volkswagen_Polo
    • https://en.wikipedia.org/wiki/Volkswagen
    • https://www.gumtree.co.za/s-cars-bakkies/volkswagen+vw+polo+vivo+demo/v1c9077q0p1
    • https://www.gumtree.co.za/s-automotive-vehicles/volkswagen+vw+polo+vivo+demo/v1c5q0p1
    • https://www.aliexpress.com/store/group/For-VW/1797079_501253029/4.html
    • https://www.autoevolution.com/cars/volkswagen-polo-5-doors-2005.html
    • https://www.manualslib.com/manual/1158893/Dometic-Tec29.html
    • https://www.manualslib.com/brand/
    • https://www.manualslib.com/brand/dometic/
    • https://www.manualslib.com/brand/dometic/inverter.html
    • https://www.manualslib.com/products/Dometic-Tec29-4416228.html
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=DA_EN&a=http%3a%2f%2fwww.birgersbilligebilboeger.dk%2fhaynes-vaerkstedsboger-og-lign%2fbiler%2f
    • https://www.youtube.com/results
    • 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_off000047d1.bin
644e54c1693af48c3c41b43206f32cb2b6769a2707d15f6dda6df465c0587489
pdf-font-stream PDF embedded font (sfnt) at offset 0x47D1 10740 bytes
font_01_sfnt_off000069db.bin
36692e71212068047e1b4e6f44fa3750b19a6b066afcfc6c3a06f59434dcc665
pdf-font-stream PDF embedded font (sfnt) at offset 0x69DB 6892 bytes