Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5f26c8e9573298…

MALICIOUS

PDF

44.4 KB Created: 2021-06-08 23:44:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0990ea98791d9e7f483b7d8a3331f69a SHA-1: f4e1caf4fe7fb7eff5e8601e7f9c4581c5549f1a SHA-256: fc5f26c8e95732980f894f60b529e601c398f06f3a3e49ee7744720d99832275
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and generators. The primary lure URL is https://netcdn.tw/app/431946152/clicker-series-roblox-hack-game-hack, which is designed to trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/clicker-series-roblox-hack-game-hack In PDF document text
    • http://library.acehresearch.org/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-website_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://collectrobuxIn 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
stream_004_off00004daf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DAF 26760 bytes
SHA-256: 1c5b77a17addf422e4a2709f0c6f0f383951d1ed88a90db8117fa26e3dd1bdd7
font_01_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 18300 bytes
SHA-256: 4d86c0ec19653cdbd75de0fd28100c5a4a19fc26323dd94f25d492ac1ca7f1c8

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