Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e6c387851e5e5a…

MALICIOUS

PDF

51.4 KB Created: 2021-06-08 09:55:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f54341f0e25977a40a34337f4cf72c19 SHA-1: 3a941c720809de6b7591b1baeecfe5ad3769a196 SHA-256: a8e6c387851e5e5a8ca5c25043aaa0ac3e96575a52b7b11325915dff4c0b44ac
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of "free Robux" and "game hacks" to trick users into clicking malicious links. The presence of a fake CAPTCHA or human verification prompt is a strong indicator of malicious intent, designed to coerce users into executing further actions. The embedded URLs likely lead to exploit kits or further stages of malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-today-2021-game-hack PDF link annotation
    • http://library.stipjakarta.ac.id/etd/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/pokemon-go-free-7-km-eggs_GM1094591345.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/get-free-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/microsoft-bing-free-robux_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_004_off0000539e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x539E 36112 bytes
SHA-256: 65810053643069c773fa6481eb30232ae15522ca88126067b0ce11afeffd763b
font_01_sfnt_off0000a4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4AB 18996 bytes
SHA-256: a5f589ba474c4811af41df8706b8ef1f38df0cce89a36fedaf483d9c62d23850

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