Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac279cfeee07a8f3…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 03:48:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b2a74043d144e9cff0d615a28c14086f SHA-1: 30e3c65ba0a7d2d7241dde335b310f146dc60948 SHA-256: ac279cfeee07a8f375f0ed4f725a2b82d404db43b775b4c61f29e0054fec166f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed exploit stream and links to a known malicious redirector infrastructure. The document body and embedded links promote 'free Robux' or 'game hacks' as a lure, directing users to the URL http://netcdn.tw/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack. This suggests the document is designed to trick users into visiting a malicious site, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-robux-kid-friendly-no-human-verification-game-hack In PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/get-robux-today-free_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-village-3_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDC 22764 bytes
SHA-256: 6d928001461e1dbfd6c47a44c46ae32fefa08f89eb97abadb7002c60b09074ef
font_01_sfnt_off000062a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A0 19760 bytes
SHA-256: 81aab0412cfb0a87b1895216bf4af503bb533c0e0c6228ebd3d86b300273636c

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