Malicious PDF — malware analysis report

Static analysis result for SHA-256 731377e167f4805f…

MALICIOUS

PDF

45.8 KB Created: 2021-05-11 14:06:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 965d6934c39cfca19c3e8ad8911a840f SHA-1: d8e635178838a79147576778cac96dcc37ddf090 SHA-256: 731377e167f4805f1d04e87cff024052bb2f649274dc9bf64b292346eb000f0f
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 0.9432

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.xyz/app/406889139/free-spins-coin-master-links-thursday-november-28-2021-game-hack PDF link annotation
    • http://wokbaarlo.nl/images/win-free-robux_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://wokbaarlo.nl/images/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://wokbaarlo.nl/images/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://wokbaarlo.nl/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/free-robux-live_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • http://wokbaarlo.nl/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://wokbaarlo.nl/images/freecoins_GM406889139.pdfIn PDF document text
    • http://wokbaarlo.nl/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://wokbaarlo.nl/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://wokbaarlo.nl/images/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://wokbaarlo.nl/images/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://wokbaarlo.nl/images/roblox-free-robux-website_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_off00004932.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4932 25468 bytes
SHA-256: 16d4b3363a30943f097d8e4a4aac3ddf04b063f206ceb63963019dc1fe258fd6
font_01_sfnt_off000081ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EC 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9D 19860 bytes
SHA-256: d63300f936d8bb545b77e0b0c2e21733cc6fa46b1c79ade6db784861823ff386

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