Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bd594cf1ef988a…

MALICIOUS

PDF

39.5 KB Created: 2020-04-07 10:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 28b76e130b2a4a94c10f288eaccc6c25 SHA-1: 170850241e67dadfbe651f64fcecd2fb2aff4930 SHA-256: 90bd594cf1ef988a8a68526fb1b6746c4dfaf1a16aefa0a96bef48366c29c665
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier with high confidence. It contains a large number of external links, many pointing to PDF files, characteristic of a link farm or SEO manipulation tactic. The primary external URI points to 'stardustedstones.com', which is likely part of a broader campaign to drive traffic to potentially malicious or deceptive content. No scripts were extracted, but the structure and numerous external links suggest a lure to external resources.

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://stardustedstones.com/uploads/1/3/1/1/131164231/131164231.html#draw+the+lewis+structure+of+the+following+molecule+hcn
    • http://chelseaart.studio/uploads/1/3/0/8/130814187/3435437.pdf
    • http://areaunite.com/uploads/1/3/0/7/130740429/df2d68ee44f9ee7.pdf
    • http://historichomelife.com/uploads/1/3/0/2/130287454/a21b3fac3af5705.pdf
    • http://ishopssb.com/uploads/1/3/0/7/130739285/69c8de.pdf
    • http://rusticallyrefined.com/uploads/1/3/0/5/130552034/tupigokiwu.pdf
    • http://izywear.com/uploads/1/3/0/3/130379798/1721294.pdf
    • http://cloudspeedmaster.com/uploads/1/3/1/4/131407818/fosumag_salomatewisazab.pdf
    • http://kaleidoscope.photos/uploads/1/3/0/5/130588296/lofenirimawevum.pdf
    • http://centralindianhighlands.org/uploads/1/3/0/5/130543063/8629978.pdf
    • http://solidsclothingstore.ca/uploads/1/3/0/5/130588672/c309f.pdf
    • http://strangenamemovie.com/uploads/1/3/0/3/130312973/lijatilafelu.pdf
    • http://livwellness.net/uploads/1/3/0/8/130874606/vekolazeloku.pdf
    • http://parentingconsultancyservice.com/uploads/1/3/1/3/131379899/4698012.pdf
    • http://lgndnewyork.club/uploads/1/3/0/4/130435881/6384659.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_off000071c4.bin
1791af39edfe6272100349fcab62b0f79deafda90080f0a2e9da803c09e2af6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C4 7920 bytes

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