Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8499a61d229298…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 15:06:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dcc0f486025fef150ee6d55204c80801 SHA-1: 227584cd073b21f9ff721118bbea6af835e3cff9 SHA-256: 2e8499a61d2292982d7b00f1faffb8c95118c5c2fe73aff86cf5f301c10ac68c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising "free Robux" or "game hacks" to lure users. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-no-human-verification-generator-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leveraging embedded JavaScript for redirection or further payload delivery.

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/free-robux-no-human-verification-generator-game-hack In PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/my-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-pet-simulator-free-game-passes_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-hack-cheat-engine-money_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-3d-models-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/robux-free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-free-app_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/doggo-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-gold-cards_GM406889139.pdfIn 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_off00002d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D14 21880 bytes
SHA-256: 92d30c8fe327b069442a3ce5f8e45b3ace7aae3a855a56448a12d087d35cc6c8
font_01_sfnt_off00005d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D50 19336 bytes
SHA-256: 7dda9f1c66f8ad938334bacfca0b21453aa6b405ce0ba8c60d4a58d10419e0cd

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