Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d9d1e309493d17…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 14:01:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f4b9b7cd9b0930fc81d1e2fe77588b25 SHA-1: 9213b63f0062d0bf67c3a089722fd70ec869df8e SHA-256: d2d9d1e309493d178819d6dd7d9e7cb5ab777fe64a923cc9557dc519c708ba2d
160 Risk Score

Malware Insights

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

The PDF contains a lure for a 'free generator / game hack' that redirects to a known malicious URL. The document body, though heavily obfuscated, contains references to this URL and appears to be designed to trick users into clicking it. The ML classifier also flagged this PDF as malicious. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution.

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.tw/app/431946152/free-chromebook-exclusive-roblox-item-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-net-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/pubg-uc-carding-method-2021_GM1330123889.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hacks-for-fallen-that-actually-work-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-client-download_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-boost-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hack-robux-apk-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/play-roblox-on-google-for-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-login-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spin-link-app_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_off000050ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50EC 25396 bytes
SHA-256: ab3a693570d368a35103b43f75c4c7194476107b1befc744b4923e155fb8a7e7
font_01_sfnt_off00008b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1A 19024 bytes
SHA-256: 845091a4d82baace035f0fef272ea2dec7844b9487ee94b31b261be50aad7006

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