Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2e1a5ca3c4824c…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 18:25:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e8425d8f744b8dd7f0c632e65e1ecd01 SHA-1: f919c5944c4fb3cd5edde35032de1cf832c439e8 SHA-256: 9b2e1a5ca3c4824c4dfb090ead478b8654100579034cc8590f4590c4412ac656
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free game hacks and currency. The primary lure URL is http://netcdn.tw/app/406889139/how-to-get-coin-master-card-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack designed to lead users to potentially malicious content or further exploits.

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.tw/app/406889139/how-to-get-coin-master-card-free-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-prices_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheat-engine-hacks-december-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-free-catalog-items-in-roblox-no-copy_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/make-your-own-roblox-skin-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-not-a-scam_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_off00002f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F16 22804 bytes
SHA-256: 1534fb971c8c5a8f540169ba672b0cb66f7f8c545d20b45d560adfd5ddeffbe0
font_01_sfnt_off00006234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 18336 bytes
SHA-256: 2280f0e6fbe29086ff047cb2b73bb4cd092e46844cee65a644b638b322da15b8