Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd846189634caac…

MALICIOUS

PDF

52.5 KB Created: 2020-03-31 06:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: cfa026cabf30414e01185c7d2f4771d5 SHA-1: e1e643ad767e74df97afd348ee31fc91da632e02 SHA-256: cfd846189634caac85fa449f0f4e4fc9300de8c3d35ea48986243f76970075a6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent. The primary attack pattern involves directing users to a vast collection of external PDF files, likely for SEO spam or to host further malicious content.

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://chewoncakes.com/uploads/1/3/1/3/131380895/131380895.html#tamu+dine+on+campus+hours PDF link annotation
    • http://thecandistore.com/uploads/1/3/0/5/130550828/jadulumev.pdfIn PDF document text
    • http://ytfavs4u.com/uploads/1/3/0/6/130621257/d03b7bff2e.pdfIn PDF document text
    • http://soviet-shrek.com/uploads/1/3/0/2/130291696/balulovireg.pdfIn PDF document text
    • http://lamethodewinningpitch.com/uploads/1/3/0/2/130274256/5396370.pdfIn PDF document text
    • http://sharedriveapp.com/uploads/1/3/0/5/130541000/gifezina-sezisabumela.pdfIn PDF document text
    • http://thingswecantbuy.com/uploads/1/3/0/7/130774970/683553.pdfIn PDF document text
    • http://thekansascityhomeinspector.com/uploads/1/3/0/4/130488754/18ab919c5055c.pdfIn PDF document text
    • http://eccevideo.org/uploads/1/3/0/9/130969926/xilefeke.pdfIn PDF document text
    • http://verniceartmagazine.com/uploads/1/3/0/3/130323892/xivokugipowe.pdfIn PDF document text
    • http://sonsofbenmovie.com/uploads/1/3/0/3/130323465/4040291.pdfIn PDF document text
    • http://twopaddlesfish.com/uploads/1/3/0/5/130551282/famevovaruromu-sajomi-duxamafamifel-kobox.pdfIn PDF document text
    • http://mypeopleindiandolls.com/uploads/1/3/1/0/131070656/97ae6b50.pdfIn PDF document text
    • http://hillcitytaxprep.com/uploads/1/3/1/4/131407655/fejinezuzinoguseleme.pdfIn PDF document text
    • http://jchomesales.com/uploads/1/3/0/6/130620390/xanusupafofixozijo.pdfIn PDF document text
    • http://northerndiversityawards.com/uploads/1/3/1/3/131384249/5073171.pdfIn PDF document text
    • http://sanblastoursislands.com/uploads/1/3/1/3/131383708/330238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4E 8376 bytes
SHA-256: e78bb351a38fd02b5e833b1fa84b92ed15608d53be67ec39e8a827ba197def4a
font_01_sfnt_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 2600 bytes
SHA-256: 41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee

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