Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38773ff30669554…

MALICIOUS

PDF

46.0 KB Created: 2021-05-12 00:04:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d6abafd6c36248cd2473ffb21aa46220 SHA-1: 9a9d561c50f93a170a13e5b784b276fa3badfc84 SHA-256: b38773ff3066955414bea5f431f3cdffd50c47734926f67b6477b9483bd1bc82
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to entice users into clicking malicious links, specifically promoting 'game hacks' and 'rewards'. The embedded links redirect to known malicious infrastructure, suggesting an attempt to lead users to potentially harmful websites or download further malware. While no scripts were directly extracted, the PDF structure and embedded URLs strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/roblox-place-rewards-game-hack In PDF document text
    • http://lib.mappifhui.org/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004797.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4797 25968 bytes
SHA-256: 88d7bddea6effab60b4f0c07c80356c7d6083667be84ac569a285b5c3811809d
font_01_sfnt_off00008351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8351 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9062 18504 bytes
SHA-256: a91422b40b1f0e9b25312e0f225173307c9cda4ba1c84b6eb7c88c6311770e07

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