Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fa88b8768e8f87…

MALICIOUS

PDF

40.4 KB Created: 2020-06-15 02:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86ec4dfb86373312d4d47646d176ce2 SHA-1: 3291d7d78d245635f0e48eade3172b223dcaee17 SHA-256: 88fa88b8768e8f87e6d6495660278009dc95d59d3bb3367cbbd025390c5a60f5
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and the title 'A textbook of optics s chand', which appears to be a lure to disguise the malicious intent of distributing numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://mta-sts.mx.jlinco.com/uploads/1/3/0/6/130621829/130621829.html#a+textbook+of+optics+s+chand
    • http://bootycamp.se/uploads/1/3/0/6/130621698/boxevela_pedumuwowukov.pdf
    • http://spassocafe.id/uploads/1/3/0/7/130740242/4278757.pdf
    • http://aliciabrockway.com/uploads/1/3/0/6/130620302/wixexiziwepet.pdf
    • http://animatorfun.com/uploads/1/3/1/1/131163977/posuxi-fubomilitonem-wubikenipexo-powokewa.pdf
    • http://workshoplevel.com/uploads/1/3/1/3/131380745/xikiw-mitamo-pafupitexolipor.pdf
    • http://ready-set-speak.com/uploads/1/3/1/4/131413550/4583000.pdf
    • http://sonasap3930.com/uploads/1/3/1/8/131856602/gawofivugoto.pdf
    • http://mx.danielecastelgrande.com/uploads/1/3/0/4/130476589/voxawesido_bamilirinagaza.pdf
    • http://trademasters.designpreviewer.com/uploads/1/3/0/7/130740003/pewosezujurusuzasobe.pdf
    • http://hostmaster.winefest.ca/uploads/1/3/1/0/131071057/wigesolup_mologama_kinusenu.pdf
    • http://bubblingbrinebrothers.com/uploads/1/3/0/2/130289467/wuzijebujuraroboxe.pdf
    • http://treeservicessc.com/uploads/1/3/0/4/130476242/lokon.pdf
    • https://nojisaxopo.files.wordpress.com/2020/06/bilufux.pdf
    • https://subujitupus.files.wordpress.com/2020/06/kogofag.pdf
    • https://bigobiguba.files.wordpress.com/2020/06/1510761765.pdf
    • https://guzubuxokom.files.wordpress.com/2020/06/furadamegatixovafuv.pdf
    • https://tamanalewoja.files.wordpress.com/2020/06/wabonaxalavavexenuli.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_off00005b8e.bin
01d9f4ee7c9e8b5e9e8e5a9776decdef95935a05cda6840200dc13abed4f7615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8E 10104 bytes
font_01_sfnt_off00007e28.bin
8d895e0ef440a72b60e96a9dedf4e7758cd1148ce3490ddf701ec694b59a5371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E28 16844 bytes

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