Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c514fc9b54b13e…

MALICIOUS

PDF

100.5 KB Created: 2020-05-31 04:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a177e0093cd01254da6d7a1cc86d3b SHA-1: aa9c129f63788140c0552d7c782cd7b8d7a1eb53 SHA-256: 31c514fc9b54b13eccec13b4d4275b34983d647e7f9d99eedcb7d2911a6f3257
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host SEO-optimized PDF files. The primary lure appears to be related to 'American horror story freak show cha', directing users to a specific HTML file. The ML classifier strongly indicated maliciousness, and the overall structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://host180.carmichaelnl.com/uploads/1/3/0/4/130490410/130490410.html#american+horror+story+freak+show+cha
    • http://ruth-ellensternberg.com/uploads/1/3/1/6/131637291/d8b2c396c0cd70.pdf
    • http://studiomcliz.com/uploads/1/3/1/3/131380265/rowivewafim.pdf
    • http://islanddream.org/uploads/1/3/0/7/130740537/5901920.pdf
    • http://galileobrazil.com/uploads/1/3/0/7/130775501/kubepejajof.pdf
    • http://lamariposacounseling.com/uploads/1/3/0/7/130776063/rivigoxitesa.pdf
    • http://webmail.rusticreflectionsdecor.net/uploads/1/3/0/2/130289296/riwuzobirireb_romobobadokebi_tewikad_nitexowunasumad.pdf
    • http://brightenglish.net/uploads/1/3/0/4/130483953/7589110.pdf
    • http://phautomotive.com/uploads/1/3/0/2/130289640/32bfef2.pdf
    • http://bloomingu.org/uploads/1/3/1/6/131606434/faruzezujagusipubana.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_off00015088.bin
cdb75e0b62fcb6a8b0fdb452f019d0246fcb509a79105b0ff08528aba1fed484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15088 25208 bytes

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