Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddcadaa5faf40e7…

MALICIOUS

PDF

47.5 KB Created: 2021-06-13 21:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a9700b6023716c8433ba791db5bb5179 SHA-1: 3118eba526c48d5d9a79707be5ff88bf4aa8c6eb SHA-256: 7ddcadaa5faf40e74855c258a592e5a501a74d4991161eef7e9852890bdfadb6
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA, likely to trick them into downloading further malware or visiting malicious sites. The document body and embedded URLs suggest a theme of 'game hacks' and 'free currency' to entice clicks. While no scripts were explicitly extracted, the presence of malicious links and the fake CAPTCHA heuristic strongly indicate an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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 http://netcdn.co/app/431946152/how-to-hack-a-piano-in-roblox-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-hack-999999-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/tiktok-free-10-followers_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-grab-points_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/como-hackear-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accounts-with-robux-2021_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_003_off000048e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E0 27888 bytes
SHA-256: 6b86da45407f57eb23d313eb02981e8040597b3427a54769687eaa3d192f4898
font_01_sfnt_off0000899f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x899F 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9646 18620 bytes
SHA-256: 93ab59943a563bb20cbc74c253e090b76e7caa8250bab43676fd25970c75df32

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