Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ac1bd7cd510f29…

MALICIOUS

PDF

39.4 KB Created: 2020-03-15 06:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4b83afca359782c718437e487272554a SHA-1: efb610a86415600720e2c539b4b152fba16c37b5 SHA-256: 17ac1bd7cd510f299a89db29331b09f454b1b85e2f2bb87f6801e00688159a50
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, including one that promises a 'facebook lite app for free', suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://jessicalgervaisbooks.com/uploads/1/3/0/5/130589342/130589342.html#facebook+lite+app++for+free
    • http://dahvik.com/uploads/1/3/0/6/130621193/2089630.pdf
    • http://hordemail.llproofreading.co.uk/uploads/1/3/0/6/130620172/24714abf981.pdf
    • http://coachinghappinessnow.com/uploads/1/3/0/6/130639546/9539130.pdf
    • http://brdpllc.com/uploads/1/3/0/2/130288412/2819600.pdf
    • http://thepointofgrace.org/uploads/1/3/0/5/130543054/447767.pdf
    • http://www.rattingonrodents.com/uploads/1/3/0/5/130550948/7659136.pdf
    • http://priorlakeselfstorage.com/uploads/1/3/0/7/130775447/bakuko.pdf
    • http://onlinewealthtools.net/uploads/1/3/0/6/130604815/428347215299.pdf
    • http://www.vilovely.com/uploads/1/3/0/6/130603936/ea99e2fa.pdf
    • http://ghz.one/uploads/1/3/0/4/130488749/vamobuga.pdf
    • http://sensacentar.com/uploads/1/3/0/5/130544090/puwev.pdf
    • http://mindfulheartprograms.com/uploads/1/3/0/6/130603927/pifapunekuje.pdf
    • http://www.jordannahernandez.com/uploads/1/3/0/6/130604744/9689750.pdf
    • http://teratype.net/uploads/1/3/0/6/130604476/mokugovosomutokatok.pdf
    • http://reclaiminghopecounseling.com/uploads/1/3/0/7/130775531/duzagetu.pdf
    • http://aliciatrammelmua.com/uploads/1/3/0/7/130739129/7230308.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_off00006ce6.bin
3904cdb8267561d30fe9265e87564c09e159b1173fa73aff371f1a02d31ae990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE6 9000 bytes

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