Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8721fa3abeab14c…

MALICIOUS

PDF

44.8 KB Created: 2021-06-10 23:20:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0d424b41ee34e268bb4180d735225787 SHA-1: d0718d8a82d6a7650e4948277f2cd0a425a1df90 SHA-256: a8721fa3abeab14cd8e9ab05604f12d907d212502a0d78e0addd7631e1b159b7
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to a malicious redirector disguised as a game hack or generator. The document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malicious content or exploits. The presence of a fake CAPTCHA prompt further supports the malicious intent to deceive the user into interaction.

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-zombie-strike-hack-script-game-hack In PDF document text
    • https://lib.unitri.ac.id//repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/boombox-backpack-roblox-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/xray-cheats-for-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/pubg-uc-gift-card-free_GM1330123889.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-place_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005049.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5049 25340 bytes
SHA-256: d4e85efaf5d377f425267c8b30fd35eff314a2d2b6eadddc48af9195228ce932
font_01_sfnt_off00008a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7E 18936 bytes
SHA-256: 810dc48958098febc46e6d55b438f4c53495479a6626d0d62afceacc8fd54771

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