Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b85d3ed0bc92147…

MALICIOUS

PDF

45.6 KB Created: 2021-06-10 23:46:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9ae703f1015c65735435c6c03b9e78fe SHA-1: dbe7636aa02cc662b1efd1dd48a52e4c84c8c9e5 SHA-256: 1b85d3ed0bc921474285928f8eaf5f776be21c318d7531e7759112217a985b8f
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 0.9864

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/hack-robar-cuentas-de-roblox-2021-pastebin-akaka-game-hack PDF link annotation
    • http://library.stembi.ac.id/repository/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-a-free-dominus-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-into-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-exucute-a-script-with-cheat-engone-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/long-pastel-hair-roblox-free-to-purchase_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-hack-pa_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/cool-outfits-for-halloween-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-roblox-noclip-exploit_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/viper-venom-fabulous-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-mod-apk-free-download_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/sistem48-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-ancient-erath-cheat-pastebin_GM431946152.pdfIn PDF document text
    • https://discordIn 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_off0000516b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516B 25516 bytes
SHA-256: 58f9ca2ffd1a63d8c362890934d62ea30026438b04a7b29949f2580121a54570
font_01_sfnt_off00008c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C97 19272 bytes
SHA-256: 73c49a47e324af18e0bbed125c86e1c9712234326985acb69ca5b43d585883ab

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