Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa27999fe7dff647…

MALICIOUS

PDF

37.4 KB Created: 2020-03-10 13:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1406e510502e14129c1b69acfe9e42cc SHA-1: 9d1d123119dbf919f4fb2e984d2040f86a03c68a SHA-256: aa27999fe7dff647d11b017f2d955187ffa907715c28b6a7d5b522823a50d9a1
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to 'simple pattern worksheets for kindergarten' and references wkhtmltopdf, suggesting a lure to educational content. The ML classifier strongly flagged this PDF as malicious, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://vps12-internal.pleasingfood.com/uploads/1/3/0/4/130477026/130477026.html#simple+pattern+worksheets+for+kindergarten
    • http://everysinglequestion.com/uploads/1/3/0/5/130588625/rodufekuberuweted.pdf
    • http://www.drcarolmarcus.com/uploads/1/3/0/2/130273812/3685485.pdf
    • http://elizaprint.com/uploads/1/3/0/6/130621312/tujofokudura.pdf
    • http://laravportfolio.com/uploads/1/3/0/6/130640123/budora-kunep-matiwuvuz.pdf
    • http://mx.colinfair.com/uploads/1/3/0/6/130621075/todasebijazawagifuz.pdf
    • http://rockymountaintoverlandexpo.com/uploads/1/3/0/4/130436014/kasafisaxegu.pdf
    • http://yrc-cooler.com/uploads/1/3/0/2/130292098/942e9a8122c7129.pdf
    • http://emilyeng.net/uploads/1/3/0/4/130476203/xitatodikoge.pdf
    • http://www.ryanmarianovolleyball.com/uploads/1/3/0/3/130313218/5b109ac7.pdf
    • http://vendeziproperties.com/uploads/1/3/0/8/130813755/8272514.pdf
    • http://tesla-energy-lights.org/uploads/1/3/0/4/130475989/c5a0d.pdf
    • http://pinthis.co/uploads/1/3/0/5/130588712/muxuge-wutisudum.pdf
    • http://acloudsolutionsarchitect.com/uploads/1/3/0/8/130815140/2888018.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_off00006af1.bin
760a528bbdafefeaf68a157802253ee303d43e22943a570c3fdb295b3bd73a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF1 7580 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.