Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3441a66a991048d…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 04:50:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e9f660fbe1538bae27fc73acd2bf7f3d SHA-1: 347f3f0870897181e0440d9cd8908fe3155c116b SHA-256: f3441a66a991048dc97074ba874c446c3983eb42279e7688dab80bfbb9196bdf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, which in turn hosts other malicious PDF files. The document body and extracted URLs suggest a lure related to game hacks and free items, likely to trick users into downloading further malicious content. No scripts were extracted, but the presence of multiple malicious links and the ML classifier output strongly indicate a 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/406889139/coin-master-free-spins-for-today-game-hack In PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-app-free-download_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-noclip-hack-2021-download_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-superhero-free_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/how-get-robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-weight-lifting-simulator-hack_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-robux-for-xbox-for-kids_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/freer-tiktok_GM835599320.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/roblox-tycoon-money-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.iosas.info/uploaded_files/userfiles/files/free-roblox-password-and-username_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
stream_002_off00003061.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3061 23272 bytes
SHA-256: bb572e6c95eedaf953d892a24216c260ced8d8299acfad533636f5836d0fd97b
font_01_sfnt_off000064ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 18528 bytes
SHA-256: 611292c7b78d9aef83f236a5f61e8588922333099173db31565d3b831f2ee55a

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