Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78d1ad2e968c6fa…

MALICIOUS

PDF

43.5 KB Created: 2020-03-15 12:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a427a8c0632b6204d281fb3ebb7f8b0b SHA-1: ee5bd35d4c5a613c57857f7794544e545ffaa66d SHA-256: c78d1ad2e968c6fa1b7ab4bbdbaee742fdf7dd31c191ba87273d4522f0ab0658
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'password safe android review'. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. No scripts were extracted from this sample.

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://www.sbsarchitects.co/uploads/1/3/0/7/130775271/130775271.html#password+safe+android+review
    • http://mrsottocounselingcorner.com/uploads/1/3/0/6/130620407/wepalijoxukawaki.pdf
    • http://mercigifts.ca/uploads/1/3/0/5/130588261/f7f568.pdf
    • http://mercedes.fit/uploads/1/3/0/6/130621483/lepojudodezimux_matifujuna_rixiboka_nujalinabetiri.pdf
    • http://comedysanantonio.com/uploads/1/3/0/2/130271111/3832080.pdf
    • http://internationalparksideproductsinc.com/uploads/1/3/0/6/130604230/nixivupumupuv_rezalofa_bujefev_pakagivurapo.pdf
    • http://teammonstersinthemaking.com/uploads/1/3/0/6/130639284/7758836.pdf
    • http://msmohp.org/uploads/1/3/0/6/130604879/kerogek.pdf
    • http://sheffieldtestpilot.com/uploads/1/3/0/6/130621892/f95c0f9.pdf
    • http://agentoftaste.com/uploads/1/3/0/7/130739223/d128cd1.pdf
    • http://www.shopthekey.com/uploads/1/3/0/5/130539886/zazeno_duveduligopok.pdf
    • http://cancunstanduppaddle.com/uploads/1/3/0/6/130604307/tiletexefuj.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_off000083e9.bin
a2798fb4b451a6611228b8663e3a6cccde898ed16f2f0093c60aa0f7c422f1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E9 7476 bytes

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