Malicious PDF — malware analysis report

Static analysis result for SHA-256 409b1655fe6e704a…

MALICIOUS

PDF

39.6 KB Created: 2020-04-11 05:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca07acd6c9e9b56460109647b6edfb90 SHA-1: f205c3265e7812efdb140dd33dd826569a92c484 SHA-256: 409b1655fe6e704af837a06ca2f244584a98b62a2a30191725891173db1a9761
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm for SEO manipulation. The document body contains text related to watching movies online, which is likely a lure to encourage users to click these links. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate a mass of external PDF links.

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://theleawoodfamilydentist.com/uploads/1/3/0/5/130544413/130544413.html#alabama+moon+full+movie+123movies
    • http://re-devine.com/uploads/1/3/0/6/130604049/dibolod.pdf
    • http://mtcraftycousins.com/uploads/1/3/1/4/131406669/4d8baf7.pdf
    • http://htownrentals.org/uploads/1/3/1/4/131454415/7698240.pdf
    • http://harrisreiss.com/uploads/1/3/0/2/130288399/1ddf13a.pdf
    • http://soulempower.com/uploads/1/3/0/7/130775465/1310972.pdf
    • http://kiddywinkskindy.org/uploads/1/3/1/4/131410736/e62943d0d7a.pdf
    • http://jirehconsultinghonduras.com/uploads/1/3/1/1/131164317/287219.pdf
    • http://joy-by-design.org/uploads/1/3/0/8/130813496/b5145b7ede3ad5.pdf
    • http://logansparks.net/uploads/1/3/0/6/130639628/gizizorogitawo.pdf
    • http://amysalchemy.com/uploads/1/3/0/6/130604922/6921366.pdf
    • http://lourdescoss.com/uploads/1/3/0/3/130313049/sijitimegowafog_lurumoxiwepetod_teverafitufer_kulipawapejuxip.pdf
    • http://travel-glam.com/uploads/1/3/0/3/130312929/bd76ef4652.pdf
    • http://mmecote.com/uploads/1/3/0/4/130435959/06cf65f3faf.pdf
    • http://discreetdatingservices.com/uploads/1/3/0/7/130740401/xupudetef.pdf
    • http://lourdescoss.com/uplo
    • 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_off00007136.bin
75ee95b3269edd669f3cc4380f202a1fecc3affa4ef79f06c8c72c7a544862e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 8168 bytes

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