Malicious PDF — malware analysis report

Static analysis result for SHA-256 0753bdbf4c7123fc…

MALICIOUS

PDF

49.1 KB Created: 2021-06-09 14:59:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bcf4461a99890c950966e3061ece2132 SHA-1: 15826ff33f4e24d6989fca44fbb4cfc5f41fc6e2 SHA-256: 0753bdbf4c7123fc9939fc96b17c13eb48d011e55aba7f690f09fc58e9295ad6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/inject-hack-roblox-game-code-game-hack PDF link annotation
    • http://perpus.unpam.ac.id/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/claim-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hack-de-game-pass-para-horse-world-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-model-purchase-request-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_004_off00005244.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5244 27252 bytes
SHA-256: c8cf6f68e79cf1aae89df0f058fac378dbf6f6ae461504a222e6daaed95f6524
font_01_sfnt_off00008fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD9 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B02 18908 bytes
SHA-256: 67c6ba55dd61cacd213600e128279bba8fceeeba2420d426db89adc4713aac08

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