Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c8b4ff4b1d8c03…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 16:47:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1b8ec0f1743251fc5347b28c8f130eed SHA-1: 4b8453709fbffd5684bcfd1774dd4b2d6506a552 SHA-256: b3c8b4ff4b1d8c0360616a57df29ace080351b7ec5e9508baec6c8553e6763ec
200 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a redirector lure, specifically impersonating Facebook to promote a 'TikTok Free Real Likes Game Hack'. The embedded URL, http://netcdn.tw/app/835599320/tiktok-free-real-likes-game-hack, is identified as a malicious redirector. This suggests the document is designed to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/835599320/tiktok-free-real-likes-game-hack.
  • 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/835599320/tiktok-free-real-likes-game-hack In PDF document text
    • http://library.thamrin.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-stuff-game-roblox_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/roblox-points_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/block-best-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-hack-roblox-accounts-2021-with-wire-shark_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/gamecheat-us-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-hack-ios-download_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_off0000347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x347A 21944 bytes
SHA-256: 702c521ee1a83862e2fadf59892e70ed06fe73914d01b4511434268318f25af2
font_01_sfnt_off000064eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 18048 bytes
SHA-256: 80b4a8cbec19ef14f6960d1f113c6fb5fd418cc3fa226f153c58295ac51396a4

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