Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eb4351fdb6ec7b…

MALICIOUS

PDF

33.0 KB Created: 2021-07-08 06:33:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bab47b3135001b6fba3b08ca3718bdaa SHA-1: a8d82e06ee7bf8fa11879c64c28ceef103007423 SHA-256: 33eb4351fdb6ec7b7bfed73d7896b7c34b858aec93199ef0cf2177e3a0f0b043
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising game hacks and free currency for popular games like Roblox and Coin Master. The document body explicitly mentions 'How Do You Hack Roblox' and includes a call to action for a 'ROBUX GENERATOR', reinforcing the lure. The embedded URLs likely serve as the initial stage of a phishing or malware distribution campaign, potentially leading to credential harvesting or further payload downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/how-do-you-hack-roblox-game-hack In PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-roblox-acc_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/hack-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/roblox-admin-hack-2021_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/tiktok-free-boost_GM835599320.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/fre-stuff-roblox_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/can-u-make-a-shirt-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.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_off00002aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA3 22080 bytes
SHA-256: 99ad3eaaaaca6d679f4302cd8b76929b2e5dc42d2e6b60a41f9a7a953cbe141a
font_01_sfnt_off00005b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B78 19292 bytes
SHA-256: 9995eaa591a4ae7360538d13bc69f9b48a4c6000d4d0fc373ba7f602d67ad74d

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