Malicious PDF — malware analysis report

Static analysis result for SHA-256 1644091708b2f6ca…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 11:48:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2d8df7ea9c180307f29453135f2aa6fd SHA-1: fff4684a784bce469d0d8cf44fa4e3b8c18fb8a6 SHA-256: 1644091708b2f6cac7f2ca8a6b542e0a594d99adda6431b32f4dc79751226a65
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirector infrastructure, specifically advertising free game currency or hacks. The document body text reinforces this lure by mentioning 'Free Spins On Coin Master Without Human Verification' and includes the primary malicious URL. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

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/406889139/free-spins-on-coin-master-without-human-verification-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-source_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/completely-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/uirbx-club-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-roebucks_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/website-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/tiktok-free-folowers-4tiktok-site_GM835599320.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-robux-for-free-2021-easy_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-generator-without-human-verification-without-tix_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
stream_002_off00003138.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3138 22900 bytes
SHA-256: f1a98188d8db00666b781a2ede42cd530b6217568331a2b776e591fee6ca114a
font_01_sfnt_off0000643d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643D 19072 bytes
SHA-256: 27ae5e168144f9143b4eb17c336d82063430b57a560ff005ec1c031da73db6d2

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