Malicious PDF — malware analysis report

Static analysis result for SHA-256 512d3830c3b6fd90…

MALICIOUS

PDF

35.8 KB Created: 2020-05-18 07:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5555f8ec23b16aa1cefd0aff316f06 SHA-1: 0981c1875206085a47da7cbb9547cfc1a71c4f32 SHA-256: 512d3830c3b6fd9031a897013cdad55f3f3941ecb2a27f03c8ce21e7263d3f99
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF links further supports this assessment. No scripts were extracted, and the document body was heavily obfuscated, but the primary malicious activity appears to be the mass redirection via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://mychoicemedicalpractice.com/uploads/1/3/0/4/130483572/130483572.html#kannada+feeling+songs+whatsapp+status+video
    • http://e-hookahusa.com/uploads/1/3/0/6/130604108/6801699.pdf
    • http://aw11source.com/uploads/1/3/1/4/131483293/3751816.pdf
    • http://billy-nelson.com/uploads/1/3/0/7/130738846/9862393.pdf
    • http://jaimoda.net/uploads/1/3/0/6/130604382/17acc50a01e.pdf
    • http://finalmemoriesmatter.com/uploads/1/3/1/4/131437420/9ef1ce9.pdf
    • http://citytocountry.ca/uploads/1/3/0/7/130776322/2547133.pdf
    • http://televerge.com/uploads/1/3/0/6/130620470/temuxakikake.pdf
    • http://luminarydistillery.com/uploads/1/3/1/8/131856270/f5a76d.pdf
    • http://east2westmedicine.com/uploads/1/3/0/3/130313632/vudawobifare.pdf
    • http://msportsix.com/uploads/1/3/0/6/130639513/76245ec051.pdf
    • http://adoptadapt.com/uploads/1/3/0/5/130590058/bitelodelatola.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_off000061ff.bin
d17f1e5305834608f3da0ddb3b7c797b09552780f8c38169edc07240d60b704d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FF 9992 bytes

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