Malicious PDF — malware analysis report

Static analysis result for SHA-256 10df482c665c93c0…

MALICIOUS

PDF

35.2 KB Created: 2020-04-21 05:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 142045fde7a96130a63e9f1407b2f787 SHA-1: bffcf26b99048bc9261fece57a5ce7e232c2d1d8 SHA-256: 10df482c665c93c05ffd4aaed68e7e3e10e0deea6e426218ac79b6432d11b57e
104 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to external resources, suggesting an attempt to redirect the user to malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a payload. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://caesarsnewyork.com/uploads/1/3/0/6/130603928/130603928.html#latest+version+of+fm+whatsapp+2
    • http://fitnesstrackerhq.com/uploads/1/3/0/6/130604416/pagizumameka.pdf
    • http://midwestduallanguage.com/uploads/1/3/1/3/131379040/kizomijowuwutujabe.pdf
    • http://922thagoat.net/uploads/1/3/1/4/131407036/fba2e.pdf
    • http://doctorfieser.com/uploads/1/3/1/6/131606065/mekixarisofebu.pdf
    • http://lemondealendroit.net/uploads/1/3/0/4/130494389/koluli.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_off00005f9b.bin
8ff225b2966af3d2dc623237737c2167f14cd3e2075beb05d0aaedeced049347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 8800 bytes

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