Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf8042ef5a57e4a…

MALICIOUS

PDF

35.6 KB Created: 2020-05-30 19:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fbd25d204c0029b8fcedcc432384942 SHA-1: f530181797a86d92891ee548a42d16192ecf64d6 SHA-256: 8cf8042ef5a57e4a4373ce4fff665a0ca4cc2a123dc9acea9bee0ca80b73cc21
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 PDFs hosted on similar domains. This pattern is indicative of a link farm or SEO spam technique, designed to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://datacademy.us/uploads/1/3/0/4/130483886/130483886.html#lineage+2+revolution+rare+skill+guide
    • http://jack-gregory.com/uploads/1/3/0/6/130620474/jabowaluvamuku.pdf
    • http://foxborooverheaddoor.com/uploads/1/3/0/4/130476229/a743defce378.pdf
    • http://printmaxpro.com/uploads/1/3/1/3/131379116/xalib.pdf
    • http://alysewilliams.com/uploads/1/3/0/5/130588705/takikeruwob.pdf
    • http://hairwaystudios.com/uploads/1/3/1/8/131871625/rurifexagelijed_mivujiku_megupogad_sojila.pdf
    • http://humboldtautodetailing.com/uploads/1/3/1/6/131608016/9268b1d8f16.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_off00005e85.bin
40a4a45b51ddc17a47b5e7931fb6a4d5154846de2f10863c3880ef2bc06443d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E85 10732 bytes

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