Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bf10a07bb78701…

MALICIOUS

PDF

40.7 KB Created: 2020-07-09 02:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf54be640113e61032e40b8a32d20381 SHA-1: de625a15912b923b4daea0e3fcae82740f3fc2ea SHA-256: b3bf10a07bb78701e3dcb673780e8fc0b5664218929b1997861084fcca5a35e0
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, and another flagged the document as a link farm. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to distribute malware or conduct phishing by directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://ttraff.com/wb?keyword=foxit%20advanced%20pdf%20editor%20delete%20page
    • http://files.talithawashington.com/uploads/1/3/0/7/130739558/guxelur_zujonet_dipuguseduv.pdf
    • http://files.artworksinmind.net/uploads/1/3/1/4/131453198/molinofuga.pdf
    • http://files.historicdogtags.com/uploads/1/3/1/4/131453056/lebaboguwikezerokin.pdf
    • http://files.makeupbybb.com/uploads/1/3/1/3/131381712/zinomezumajiwet_xamaminiwoxesus_radan_gekero.pdf
    • http://files.kayscience.com/uploads/1/3/1/1/131164039/dujulazalagozozexal.pdf
    • http://files.animachristiretreats.org/uploads/1/3/0/7/130738933/nosepovefi.pdf
    • http://files.wolfiesofwarwick.com/uploads/1/3/2/6/132681343/086ec.pdf
    • http://files.bellafurworks.com/uploads/1/3/1/8/131856381/duguvat.pdf
    • https://dodizuzila.files.wordpress.com/2020/07/11466221089.pdf
    • https://dunawudawoma.files.wordpress.com/2020/06/xipokuxetalumivegaxuredo.pdf
    • https://soferos.files.wordpress.com/2020/06/mubujuwukitejevukunefiga.pdf
    • https://fijiwam496225947.files.wordpress.com/2020/06/rutonusafadamipirigilulum.pdf
    • https://jetagub.files.wordpress.com/2020/06/xivewulisisum.pdf
    • https://jixuvozigip.files.wordpress.com/2020/06/nutedekum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe1.bin
8dfc51e2735fe9a332832d9277644a5435821577d4eaa40ffe3633e11bfd3f5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE1 5016 bytes
font_01_sfnt_off00007109.bin
f7377ed43b9da1c7195816fbd389bf0778a5befd37d00415d5878965a4e4fcc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7109 11300 bytes