Malicious PDF — malware analysis report

Static analysis result for SHA-256 3267480d6c445b33…

MALICIOUS

PDF

185.3 KB Created: 2016-09-06 03:24:59 +03:00 Authoring application: RAD PDF (via RAD PDF 3.5.4.1 - http://www.radpdf.com)
MD5: c75a3a378c507fc5f57bef4e598521f5 SHA-1: 13c86bed918e1316cf1eff51b3afb40a251b9c0d SHA-256: 3267480d6c445b33b7afb55f99478f4463fe8f2b44e66e30f0c747c06a0c229b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.003 Windows Command and Shell

This PDF document is designed as a lure, presenting an image to the user while hiding clickable links. It contains multiple heuristics indicating it's an image-based lure with invisible links. The primary goal appears to be the delivery of a batch file payload from 'ayakkokulari.com/order.bat' via a series of redirects, including a URL shortener.

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/order.bat
    • 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_off00000705.bin
5ac8081473c1dfdff367dec1b5ffe2dc89973d2410ec8eaaf6a41df21d5e8b72		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x705 197940 bytes
stream_001_off000173eb.bin
19e400a0beed6057e1c9387642f48c0d91996a7603eeec385bce2c36d37b201c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x173EB 170956 bytes

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