Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb21aa2003d0c41…

MALICIOUS

PDF

49.6 KB Created: 2021-06-09 01:08:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 21f655b391fb940327b08e6a13385206 SHA-1: f757059104bf0babb169adc90c6baf9a7186e5e7 SHA-256: fdb21aa2003d0c41e05de137cca9c1410fa2710d856a328e1d4771d0387781a3
200 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, presenting a fake CAPTCHA and a download lure to trick users into clicking malicious links. These links lead to a known redirector infrastructure that ultimately serves game hack-related content, likely as a pretext to deliver a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-lumber-tycoon-hack-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/static-moonactive_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/tiktok-free-2021-followers_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-without-human-verification_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_004_off000051ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AB 27832 bytes
SHA-256: 22012437ac2c6c2a9061be0b13c2f8bc5f258cb26664ecf0015f87c5f1afd1a2
font_01_sfnt_off000090d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D7 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE8 18760 bytes
SHA-256: 19976d0b6c1004c990ea317119c545bb5f9ed2ffdf1712014dcb1bb5f176702e

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