Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae1fa558361713a…

MALICIOUS

PDF

42.0 KB Created: 2020-05-19 22:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20b5bcd488d81e3ed60d8d91c043d9fa SHA-1: a691e10aef9611cb2b0386c015e913c484e3239c SHA-256: 3ae1fa558361713af834932785546e8b65682a1f58cdf86ee7849c43f9f0f9e0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Uglies study guide answers' and embedded URLs, suggesting a lure to external content. The primary attack pattern involves redirecting the user through a link farm to potentially malicious or unwanted content.

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://nashobavalleyextractco.com/uploads/1/3/1/3/131380814/131380814.html#uglies+study+guide+answers
    • http://sunfabss.com/uploads/1/3/1/6/131637430/febonal.pdf
    • http://hpitconsulting.com/uploads/1/3/0/5/130551202/kikokexikurumum.pdf
    • http://feedds.org/uploads/1/3/0/2/130291769/gasexotopowobag_kaforesuf_rakejam_ditidur.pdf
    • http://beachwoodfinecarpentry.com/uploads/1/3/1/4/131483126/2909778.pdf
    • http://kissmyicess.com/uploads/1/3/0/2/130289270/numativep.pdf
    • http://maritimeadvisory.com/uploads/1/3/0/5/130551258/ruzuwakasaraluger.pdf
    • http://consumingglory.com/uploads/1/3/0/2/130289171/getef.pdf
    • http://asphaltisland.com/uploads/1/3/0/6/130639419/3636010.pdf
    • http://thekregels.com/uploads/1/3/0/5/130550716/lexilotoriko-defowen-lorad.pdf
    • http://manosunidasac.com/uploads/1/3/0/5/130545484/74a3d3b9f9875b.pdf
    • http://richspirit.net/uploads/1/3/0/7/130774969/58cb12df77d869.pdf
    • http://forexgrandfinance.com/uploads/1/3/0/2/130291556/8436204.pdf
    • http://northcountrystoragebarns.com/uploads/1/3/0/5/130551019/3709206.pdf
    • http://garyleerohr.com/uploads/1/3/1/3/131383207/5519756.pdf
    • http://eleven-ideas.com/uploads/1/3/0/6/130621973/3bf08ab6cb.pdf
    • http://carlospark-playablanca.com/uploads/1/3/0/5/130551749/4630798.pdf
    • http://alexenger.com/uploads/1/3/0/5/130589442/jufulepevijilov.pdf
    • http://djchronicles.com/uploads/1/3/0/5/130551615/lewot.pdf
    • http://handwriteforme.com/uploads/1/3/0/3/130313336/paduwat_vodupe.pdf
    • http://mylittlemutant.com/uploads/1/3/0/5/130551417/4496461.pdf
    • http://kelseyleon.org/uploads/1/3/0/5/130550844/2124891.pdf
    • http://negotiateconsulting.com/uploads/1/3/0/7/130739082/zabumenuvu_zarap.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_off00007965.bin
e735f9b573e577a7616161e0375777498044fbfe5c829a077232382ba8499dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 10288 bytes

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