Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc39cdde4c19f8e3…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 20:14:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 86cd9ff5ac4212b07a5ac3e9f00b0f63 SHA-1: 0d64aa9761a83a9f49d81d2cf196e92d39623ea8 SHA-256: fc39cdde4c19f8e3dc6c59cff5191cd436bc727120e20668084a37f7c753993a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free robux'. The primary malicious URL identified is http://netcdn.tw/app/431946152/lemonaid-roblox-hack-game-hack. The document's content and embedded links strongly suggest a phishing or scam attempt designed to lure users into clicking malicious URLs, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://netcdn.tw/app/431946152/lemonaid-roblox-hack-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-easiest-way-september-2021-yummers_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-offers-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-do-i-get-robux-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-2021-control-panel_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cheat-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/tiktok-free-movies-site_GM835599320.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-prisoner-life-speed-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-downoad_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/robux-hack-script-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-cheap_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/secret-robux-hack-revealed-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/www-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-yin-vs-yang-cheat_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-redeem-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-purple-guy-shit-free_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/my/tasksIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x319B 21508 bytes
SHA-256: ce01f6791886608e38ab6e14c7b0d98162b159724e33310d7cd328aae6fd5e21
font_01_sfnt_off0000607e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 19208 bytes
SHA-256: 398fdfbe2aa1b4d23588b095a1d6c302edc779ba10a51de96381b827436d1373

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