Malicious PDF — malware analysis report

Static analysis result for SHA-256 157d088289b27256…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 15:35:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 50c6b9bae22d732c0d39d81d8aa1dcb4 SHA-1: 0f4f3d5ffa77f7780629dd626097c0fa9f2e6850 SHA-256: 157d088289b2725661073ebb16f4294f37bf82cffe70e1ebc428228ed5b088d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.tw', which is identified as malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks and currency, likely to lead users to a phishing or malware download site. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/431946152/roblox-script-hack-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-easy-on-pc_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-admin-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/badges-central-london-united-kingdom-hack-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/robux-roblox-hack-tools_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-admin-roblox-script_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-ingame-editor-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/rbx-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-redeem-shoprobuxiancom-tutorials-freerobuxcodegenerator_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/hack-tutorial-xb-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-free-robux-app_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/can-you-make-a-minecraft-server-for-free_GM479516143.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_off00002dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFB 22476 bytes
SHA-256: 5adfd2b7bb3343a2122e11a4707f0b617799ba2e84176047597b0f8b3991e0f7
font_01_sfnt_off00006042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6042 19056 bytes
SHA-256: bb76e7a39623e8e346641af63eba4df40d7f195b132658733982612819f2f46a

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