Malicious PDF — malware analysis report

Static analysis result for SHA-256 8939a9c02bc9fa71…

MALICIOUS

PDF

36.0 KB Created: 2021-07-04 23:42:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a52559be8f21568a0aedc8f090618f7 SHA-1: fa11d839294903ddea5d43a72cc733513741ee0c SHA-256: 8939a9c02bc9fa71b9cc0e570b335fb5dbcadcc708c57be312584b6bb64c578f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically targeting users with lures for game hacks and free currency. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-free-spin-link-today-16-11-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

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-spin-link-today-16-11-2021-game-hack In PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/roblox-free-robux-give-away-lve_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/roblox-hacks-to-buy_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/tiktok-likes-free-trial_GM835599320.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-levels_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/robux-hack-generator_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_off00003507.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3507 22456 bytes
SHA-256: 84251a24fa801ab6c895a135be7f89f47561e0de9693e648b050e01ca2431456
font_01_sfnt_off000066f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F3 19268 bytes
SHA-256: 90a488f9b8999737cef3a0de8620127c76078de1ea7567fa995da797b82280b8

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