Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8fdd90acaeb053…

MALICIOUS

PDF

83.3 KB Created: 2020-04-20 02:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fce596f8ea96035e8acb2dc03cd82c16 SHA-1: 06f550c875b1244b8c62eb0dcc0933bb932b8334 SHA-256: bf8fdd90acaeb0532bff554404b15d7f2af2a0586a980fc8aa7d56fe8c601ba9
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files on unrelated domains, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains references to 'free hip hop album websites' and the wkhtmltopdf generator, indicating a lure to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yogaandasianbodytherapy.com/uploads/1/3/0/3/130379101/130379101.html#free+hip+hop+album++websites
    • http://thetexashomebuyers.com/uploads/1/3/1/3/131398560/52eb501c5189413.pdf
    • http://essentialoilsonline.ie/uploads/1/3/0/9/130969925/1767972.pdf
    • http://siliverlake-designs.com/uploads/1/3/0/6/130639110/judugidilufuzujebiru.pdf
    • http://nexuspointrecordings.net/uploads/1/3/0/3/130313336/nurifekux-zanepizi.pdf
    • http://veinlesslegs.com/uploads/1/3/0/3/130312916/kejubetejivisu-dozamokibig-gekozaguzop.pdf
    • http://telcommsolutions.net/uploads/1/3/0/3/130379466/1976788.pdf
    • http://palimpsestproductions.com/uploads/1/3/0/3/130323335/fd93830.pdf
    • http://karefullyorganized.com/uploads/1/3/1/0/131070045/komelobumejudet.pdf
    • http://coolsculptingsonomamarin.com/uploads/1/3/1/3/131398259/sejirutidadiv-sewilixo-lugoxif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa28.bin
2018bb97123ece010e5da51fecc15bd3363045ff6ed2b81f4bf5e299256b3ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 9148 bytes
font_01_sfnt_off00011c8b.bin
59d8a097129a595d6828513bcc5b4d47c00a7c4de9545a43efee4f2c176228e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 4288 bytes
font_02_sfnt_off00012a16.bin
b080e6aa9682ff87567a230b404ab00780bafcfd3ba11e3f536b788ca6e08ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16060 bytes

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