Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa255dea2f37c7e5…

MALICIOUS

PDF

45.1 KB Created: 2021-06-08 23:00:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2fc2cb94051586c3261b761f95a183c0 SHA-1: 69e198dba4d735d9b46ea11e6ba3ca11eae1129b SHA-256: fa255dea2f37c7e5b794578a5d1630b5b91e7dce32a248ae5939b6c9c52e24c5
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and free currency to entice users. It presents a fake CAPTCHA to trick users into interacting with malicious links, such as the one pointing to 'https://netcdn.tw/app/431946152/roblox-jailbreak-unlimited-money-hack-game-hack'. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead users to potentially harmful content or further exploit stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/roblox-jailbreak-unlimited-money-hack-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/games-where-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/comment-hacker-des-map-roblox-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-generator-2021_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_off00005210.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5210 24340 bytes
SHA-256: 21c0a780e12c6570ae022549865ca2f16d377c5db6acf9f3d1bdb02fceb53a5d
font_01_sfnt_off00008a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A04 19568 bytes
SHA-256: 01a8707638a13e5c91383d181050d1d2d765ee51da9a0f38766e2b35d67bb184

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