Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ca9bea75472bd7…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 08:29:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5825135cb33ae258a6b3bee6ffabfb1a SHA-1: afb1de59b66ea5c53dc5836666f9510f3e7655f2 SHA-256: 03ca9bea75472bd750768d9d5a17ee670186b985defac7d4fa90ba2662914e23
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a 'free generator / game hack' website, which is identified as malicious infrastructure. The document body and embedded URLs suggest a lure for game-related cheats or currency, likely intended to trick users into downloading further malware or visiting phishing sites. No scripts were extracted, but the presence of malicious redirectors and the lure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-hack-xyz-download-free-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-hack-no-human-verification_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_004_off00004dc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DC8 24288 bytes
SHA-256: 1d74d72e02a7e072402c146812744ccbae54946d49331f53cca0450622bdc998
font_01_sfnt_off0000858d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858D 18952 bytes
SHA-256: 779e1b2868c6fd3267453bb754d4fa6de943de141d85dc4b922527d53be01414

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