Malicious PDF — malware analysis report

Static analysis result for SHA-256 540b4517fa24008c…

MALICIOUS

PDF

41.7 KB Created: 2020-03-25 05:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b24039e414b19eadc03900ee2819e538 SHA-1: 6d5b0cfbf252dece4e682578429f2d7e1de44280 SHA-256: 540b4517fa24008cc570cf4329034e84eedf186640e271d8e68bb790c6a8d2ef
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of an SEO poisoning or link farm attack pattern. The ML classifier strongly suggests maliciousness. The document body, though partially corrupted, contains references to educational topics and software versions, likely as a lure. The primary attack vector appears to be directing users to a network of malicious PDF files hosted on numerous domains.

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://stopeurocide.com/uploads/1/3/0/4/130488914/130488914.html#ecuaciones+de+segundo+grado+resueltas+2+eso
    • http://ryan4iowa.com/uploads/1/3/0/6/130604402/vituzadudidomawezip.pdf
    • http://olares.com/uploads/1/3/0/5/130551949/5016301.pdf
    • http://puppyfreshinc.com/uploads/1/3/0/4/130490314/tolam-gazafiforisiluz.pdf
    • http://www.cabacoa.com/uploads/1/3/0/7/130739280/ad06698cea965.pdf
    • http://aliceinveganland.com/uploads/1/3/0/5/130588894/pipizegoj-nudov-lajupowikusema.pdf
    • http://muttleys.ca/uploads/1/3/0/6/130620501/pomenegeke.pdf
    • http://www.homeloans80016.com/uploads/1/3/0/6/130621325/wesemebufojif.pdf
    • http://alamopsychiatry.com/uploads/1/3/0/3/130379336/lalegames_bolixiwodut_xezosewaro_dusifesivol.pdf
    • http://mydiabbyhc.com/uploads/1/3/0/6/130639317/gebalesipak.pdf
    • http://www.barbiescloset.co/uploads/1/3/0/6/130604299/333677.pdf
    • http://www.sbaorg.org/uploads/1/3/0/5/130588550/6b7b6.pdf
    • http://mystarcleaner.com/uploads/1/3/0/3/130323455/1847420.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000777f.bin
bd18c877ba48ecd4d0066abc669a9eb1555cf6ce3ac759a96de15bafc512b903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777F 9028 bytes

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