Malicious PDF — malware analysis report

Static analysis result for SHA-256 1686c9b864c43aa6…

MALICIOUS

PDF

35.3 KB Created: 2021-07-07 00:10:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cf4cce2bd7cb3a1d38dc10fecd401947 SHA-1: 94bd665cab3a782e8487dba6261555cace2baeb2 SHA-256: 1686c9b864c43aa6050ec2abc88bf9baf10b991a97b8f4430db2878ba1bf8750
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 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-pet-food-links-game-hack PDF link annotation
    • https://susantomeubel.com/ckfinder/userfiles/files/how-do-you-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/kuso-icu-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/robux-games_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/hack-roblox-galaxy-itan_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/como-hackear-cuentas-roblox_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/roblox-redeem-codes-free-2021_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/speed-hack-roblox-wild-revolvers-download_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/roblox-free-skin_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/roblox-adopt-me-free-ride_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/roblox-race-track-free_GM431946152.pdfIn PDF document text
    • https://susantomeubel.com/ckfinder/userfiles/files/free-roblox-from-promocodes_GM431946152.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_002_off0000329b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329B 23140 bytes
SHA-256: 7f1f378c4fdb9d824cac6796e8016006f2b817011b66ae78330a52b25f96854b
font_01_sfnt_off000066d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 18496 bytes
SHA-256: 42320e27e2ff961517b3e3de4779e9c87c003b60669647e388f9880bb3e4a6bc

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