Malicious PDF — malware analysis report

Static analysis result for SHA-256 162c5d47485e17ec…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 02:46:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 70ce8e4cf5065c07aef1261842247419 SHA-1: b2f989366c7dee2048e206380d39449fa3e996cb SHA-256: 162c5d47485e17ece037e63fd66b8ae506f26b69b00f008402e0eea4e0125d36
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links, including one identified as a malicious redirector leading to a 'coin master app' lure. The document body and heuristics indicate a clear intent to trick users into visiting this malicious URL, likely to download further malware or engage in scams. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or social engineering attack.

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-app-for-free-spins-game-hack In PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/what-is-robux_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-brown-pant-roblox_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-robux-hackget-up-to-22-500-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/bloxgain-free-robux_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-robux-glitch-xbox_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/free-robux-giver-2021_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.alloywheels.in/uploaded_files/userfiles/files/coin-master-game-hunters-club_GM406889139.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_off000031f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F0 22352 bytes
SHA-256: 3e1cff6d8f895fa9f8d485e84249d0d22cc3d5b696ae434331fabefe2e28306d
font_01_sfnt_off000063bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BC 18176 bytes
SHA-256: bc884a3229ed83de6fe0f09d3de4cbfae9ae8b960387018b9df9e9e5860be4ee

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