Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0417e31b26f431…

MALICIOUS

PDF

34.2 KB Created: 2021-06-27 06:34:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: aa7a83bd30a9cafd7e4ce35581c668e1 SHA-1: b8b7940715b6a41a4d15126f3244714a83a34808 SHA-256: 7d0417e31b26f431297ed69f7deaeb138f883b5dbb2d2a2d1c89d969b37bbce1
160 Risk Score

Malware Insights

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

The PDF contains multiple links, including one pointing to known malicious redirector infrastructure at http://netcdn.co/app/431946152/free-robux-com-roblox-game-hack. The document body and heuristics indicate a lure for 'free Robux' or game hacks, a common social engineering tactic. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to potentially harmful websites, likely for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-robux-com-roblox-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/cheat-engine-v3-roblox-download_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/was-roblox-hacked-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-free-play-no-app_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-admin-group-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/jailbreak-cheating-essentials-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/is-there-a-way-to-get-free-bobux-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-cheat-in-musical-chairs-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/game-hunters-coin-master-free-spins_GM406889139.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_off00002eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAA 22472 bytes
SHA-256: 3758b13e6124b503bc7509afb74b02dd9e416b518753ca430bf5725f431863df
font_01_sfnt_off000060d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D9 19052 bytes
SHA-256: f1c402a5b139f7054ce39ccfb5800536152a5b826a5c5a7ec81e6f9b67a9d2f8

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