Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ab704357c46b54…

MALICIOUS

PDF

33.3 KB Created: 2021-07-06 06:53:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c6ac876f4a74919d77b8cbf74d8516c2 SHA-1: a38d5b556fdb8654f69862ba6d144ccf7a42aaec SHA-256: 54ab704357c46b54dd5712ea0d81387b4d31ef639679ab69e999484e1d0bf112
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that lead to a known malicious redirector, specifically advertising "free Robux" or "game hacks". The ML classifier also flagged this PDF as malicious. The document body text and heuristics indicate a lure for free in-game currency or cheats, which is a common phishing tactic to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.tw/app/431946152/wahoogaming-co-free-robux-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/walkspeed-hack-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-csgo-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-apocalypse-rising-cheats-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hacks-for-roblox-murder-mystery-2_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free4mobile24-com-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-egt-free-robux-robuxian-youtbe_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-money-roblox-audio_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/is-robux-free-for-today_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-without-email_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_off00002aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AEE 22216 bytes
SHA-256: 065a2b77be5a63730b89eda994f809f11befa606e18ceec78e22b4a4ce4b253a
font_01_sfnt_off00005c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C65 19460 bytes
SHA-256: 74065a4619e2e03bb286e1d51fa8cb1024f73915723fc40e3305b74db5537c96

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