Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a9188cf2dd6066…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 19:18:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 797c91ec8e98563173fc09adccda87ed SHA-1: a122c0a290fb1709d236458cd25535683fc955ef SHA-256: e6a9188cf2dd6066e13171975aeeb9a69a67b2c4c6a8241d6da3c722e6fff5dc
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a game hack lure, specifically for Roblox, to trick users into clicking a malicious link. The link impersonates brands like PayPal and redirects to a site hosted on 'netcdn.online', which is not associated with the impersonated brand. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/roblox-anime-fighting-simulator-hack-game-hack.
  • 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
  • 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 https://netcdn.online/app/431946152/roblox-anime-fighting-simulator-hack-game-hack PDF link annotation
    • http://www.flytec.com.py/download/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/without-human-verification-pubg-uc-hack_GM1330123889.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005305.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5305 25164 bytes
SHA-256: ba46dc2de0f156cd231c3e9891342d002e7c205c08984b8646ec9123546016b0
font_01_sfnt_off00008c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C56 2896 bytes
SHA-256: a9734f601ab51531ddc627968baf99e061fe05a52d08fb24eabe5a53f69c0820
font_02_sfnt_off00009655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9655 19424 bytes
SHA-256: 35c20c942693219c36c0a40fc98013cc060d8117cdfca559383b25b29c16debe

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