Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9114b7c3b40da09…

MALICIOUS

PDF

185.3 KB Created: 2016-09-06 03:24:59 +03:00 Authoring application: RAD PDF (via RAD PDF 3.6.0.0 - http://www.radpdf.com)
MD5: 2816348763da91dc786f725eda8f984a SHA-1: 7382bf0b2fcb003cb22eda7f0b8e279de294bc41 SHA-256: e9114b7c3b40da095573ee73c87ee6d503207a5b36fa72fef5a2a6998be9fef6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF is identified as an image-based lure, containing multiple links designed to trick the user into downloading a payload. Specifically, it directs users to 'http://ayakkokulari.com/PurchaseOrder.exe' via an invisible link, and also uses a URL shortener 'http://bit.ly/2ciZJon' which likely redirects to a malicious destination. The ML classifier also flagged this PDF as malicious with a high score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8569

Heuristics 5

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • Image-only PDF lure links through URL shortener high PDF_IMAGE_LURE_SHORTENER_LINK
    PDF is image-heavy with little real text and its clickable action points to a URL shortener. This is a high-confidence credential-phishing carrier shape: the visible page is a screenshot-like prompt while the destination is hidden behind redirect infrastructure.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 185 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://balajithresher.com/ivxn/home/index.php
    • http://ayakkokulari.com/PurchaseOrder.exe
    • http://www.radpdf.com)/Author(windoes)/Creator(RAD
    • http://www.dynaforms.com
    • http://www.radpdf.com
    • http://bit.ly/2ciZJon
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off0000070d.bin
5ac8081473c1dfdff367dec1b5ffe2dc89973d2410ec8eaaf6a41df21d5e8b72		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x70D 197940 bytes
stream_001_off000173f3.bin
19e400a0beed6057e1c9387642f48c0d91996a7603eeec385bce2c36d37b201c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x173F3 170956 bytes

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