Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57115973a4fb052…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 08:33:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 566740f840a0d4c64cd6a2cc793669ef SHA-1: ad8d7a76051fe886ccacce3f2c8dccf8bf5fbc2f SHA-256: a57115973a4fb0525fa4d79eb49d31134279cea22c3c0465af3bf2a46fd70f72
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to malicious redirectors, disguised as a "free generator / game hack" for Roblox. It also displays a fake CAPTCHA to trick users into interacting with the malicious content. The embedded URLs are designed to lead users to potentially harmful websites, likely for further exploitation or credential harvesting.

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.online/app/431946152/how-to-hack-roblox-to-get-free-robux-game-hack In PDF document text
    • http://handimanlibrary.org/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-get-free-robux-without-verifying_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
font_00_sfnt_off000050c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C2 26240 bytes
SHA-256: b5307779ec3ac11fb820a64b8f39a83d0ca02f0039a351ba6c2394e181c51f95
font_01_sfnt_off00008ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADA 18756 bytes
SHA-256: a768fd9037f2962d7d468f6b0310abba3890de72b41426d235b5de2790bab1ac

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