Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0dcb91ff92386c…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 08:54:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2976ec0817f27cea082ca6daca3f58c9 SHA-1: 836a21219fb275e3c26f6b8bf2224a3b122c6738 SHA-256: db0dcb91ff92386c7f8c50481aec6a25dff7dab9a4c236cb26d1351fdd4fb65e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to websites offering game hacks and generators, with one critical heuristic identifying a direct link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Coin Master Daily Spins and Coins' and a URL that aligns with the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-daily-spins-and-coins-game-hack In PDF document text
    • http://pustaka1.unindra.id/repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/royale-hich-dimond-hack-2021-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-tiktok-likes-and-fans_GM835599320.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-spins-link-today-new_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
stream_004_off00005668.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5668 25052 bytes
SHA-256: 03358361fa09b1d3fce65ffa77e1e73c02f382b642e2b8949bbf0da3257a4203
font_01_sfnt_off00009035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9035 18320 bytes
SHA-256: 72bd1e2907631a8d3a24a2cbbaf0d47ee6e4295bb5156def0c8a538e1f6b3f69

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