Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b9a15288607042…

MALICIOUS

PDF

42.0 KB Created: 2020-04-07 15:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15c3ecbc681a057333bdd4d243cc3d74 SHA-1: 9a4201b407bd156c6f68e3099fc53e0eb1eba556 SHA-256: 90b9a1528860704234b3bdb5aff5064983cc4de7b2b7ee1b8b690dadc2a32515
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique commonly used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, reinforcing the link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://craniosacralnashville.com/uploads/1/3/0/8/130813546/130813546.html#tai+chi+24+form+names
    • http://thecuratorconsultancy.com/uploads/1/3/1/3/131398036/13403b1385d33fb.pdf
    • http://blu-ray-sales.com/uploads/1/3/0/9/130969647/eb84aa74644dc3.pdf
    • http://julias-book-blog.com/uploads/1/3/0/4/130436173/283065b7.pdf
    • http://adreamed.net/uploads/1/3/0/7/130739560/pewuzotovoliw.pdf
    • http://passmankade.com/uploads/1/3/0/6/130639437/lusatixijoza-pawiwewi-pudamexulak.pdf
    • http://kaitlynleewilson.com/uploads/1/3/0/3/130323116/44b068b16969.pdf
    • http://highlifeproduct.com/uploads/1/3/1/3/131379949/keleruzupiluw.pdf
    • http://schmittsanimalhospital.net/uploads/1/3/0/6/130621947/6669094.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006932.bin
ff5d3cc295915130b5866c64a570e48b926bff21942b3b49313285d14aa8420b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6932 7452 bytes
font_01_sfnt_off0000866f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x866F 16036 bytes

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