Malicious PDF — malware analysis report

Static analysis result for SHA-256 985001a930b4c1b2…

MALICIOUS

PDF

56.2 KB Created: 2020-03-26 13:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 22b0b9fc8860e00b74351b924d8ca54a SHA-1: 8e3fdc586559c90abeb977d6760f6e4e87cf914d SHA-256: 985001a930b4c1b272d713f4cfbdbd31b0eb9f336a44e4ae90f1408898dac868
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Manhattan gmat critical reasoning pdf' and URLs that appear to be part of a link farm, suggesting a lure to drive traffic to potentially compromised or malicious content. The ML classifier strongly indicated maliciousness.

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://bshppopup.com/uploads/1/3/0/5/130589288/130589288.html#manhattan+gmat+critical+reasoning+pdf
    • http://9f60fpk003.com/uploads/1/3/0/5/130538863/semuf-buzibugu.pdf
    • http://stoccolab.com/uploads/1/3/0/3/130379529/8270287.pdf
    • http://mariamurillo.net/uploads/1/3/0/4/130436162/poloso.pdf
    • http://lifefitnessmatters.com/uploads/1/3/0/6/130622106/mutuniviw_kozobita.pdf
    • http://mail.argentaelectronics.com.au/uploads/1/3/0/4/130489265/3361429.pdf
    • http://asdjgiehjsapeqkkq.com/uploads/1/3/0/7/130738623/8627555.pdf
    • http://www.loveisthewayhome.com/uploads/1/3/0/8/130874292/2883691.pdf
    • http://davidhimmelstein.com/uploads/1/3/0/4/130436367/9363325.pdf
    • http://www.rscollegesupport.org/uploads/1/3/0/6/130605381/508ddd76b41c03.pdf
    • http://greenwoodgirls.com/uploads/1/3/0/6/130621352/serubedepebus.pdf
    • http://bigjimsbonding.com/uploads/1/3/0/3/130323190/293017.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_off0000b23a.bin
78e0faf92653b47668ce83187d9b6f16acf2bd1f2ba7f22deedee8221b42ace0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB23A 8760 bytes

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