Malicious PDF — malware analysis report

Static analysis result for SHA-256 30dfb8beafd0aea8…

MALICIOUS

PDF

40.9 KB Created: 2020-04-05 06:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c57a05a90448c43f7311b2adccb40cfc SHA-1: 7b5668114b6bb20826bb4d62805a801f603a7a7c SHA-256: 30dfb8beafd0aea804481be9b1046d1c41137cd1c8a06f48934ee39a47e45360
94 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with a heuristic firing for 'PDF_SEO_LINK_FARM' indicating a mass of external links. The document body contains a deceptive title 'Juegos de esquivar cosas' and numerous embedded URLs, suggesting a lure to external, potentially malicious, websites. No scripts were extracted, and the primary malicious activity appears to be redirecting users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://geoforcetexas.org/uploads/1/3/0/6/130621115/130621115.html#juegos+de+esquivar+cosas
    • http://cutestcabins.com/uploads/1/3/0/5/130551615/gagirigexosi.pdf
    • http://ntsika.net/uploads/1/3/0/2/130272603/cfa9052.pdf
    • http://lushandlaughter.com/uploads/1/3/1/3/131378950/famevunojebu.pdf
    • http://healthyliving247365.com/uploads/1/3/0/7/130739633/ce3372af06075.pdf
    • http://scifionyourwifi.com/uploads/1/3/0/6/130604716/6682892.pdf
    • http://vittonezone.com/uploads/1/3/0/2/130271153/bogolumo-givix-rexulinik-kazutituv.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_off0000616b.bin
f377b83afbb3cd670b9eede09ae59f5a62c236df3f3ab400b7ffad1944c993dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616B 8956 bytes
font_01_sfnt_off0000825f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825F 16036 bytes

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