Malicious PDF — malware analysis report

Static analysis result for SHA-256 d820a238b1802e43…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 09:48:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b8afe5f85d27b632ca5fcd9cb8a1c9f SHA-1: 1b3f0e9fc47a59daba561f13afe974f250d705ce SHA-256: d820a238b1802e4350efb4ba2d2a896a85981e10a5ea4f214a244cd5959c9101
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 0.9865

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/como-hackear-roblox-rapido-y-facil-game-hack PDF link annotation
    • http://stpc.it/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/robux-hack-apk-pc_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/cheat-for-roblox-payed_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-game_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-coins-link-2021_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_off0000513f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x513F 25992 bytes
SHA-256: b8093532bc454903783b222e6235e720b0a5e1d4724ded536df3cef30e104da2
font_01_sfnt_off00008ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC8 19240 bytes
SHA-256: dab32a2690e0ae549d3f7c191e772f79cb39d307239eee2c2ebf257b91d0e495

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