Malicious PDF — malware analysis report

Static analysis result for SHA-256 5351719e3addd445…

MALICIOUS

PDF

36.9 KB Created: 2021-06-20 05:14:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 06b435f5262481a687cf8f7381f68173 SHA-1: b5e655a2b83150250458ebe9aa2485a1e1609278 SHA-256: 5351719e3addd445f5391b90d3e0abb5cb4c7ed209ba2681a0348ad3862f23c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a lure for free game currency (Robux, Coin Master spins), directing users to malicious redirector infrastructure. The primary link, http://netcdn.co/app/431946152/how-to-get-free-robux-inspect-no-waiting-saves-game-hack, is flagged as malicious. This suggests the document's purpose is to trick users into visiting these sites, likely as a precursor to malware download or phishing.

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.co/app/431946152/how-to-get-free-robux-inspect-no-waiting-saves-game-hack In PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/generetaror-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/can-i-have-a-free-nanner-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/robux-get-com_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/how-to-hack-something-into-your-roblox-inventory_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://www.peterbarsony.com/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3690 22788 bytes
SHA-256: aaa0af4099b4022284f1f2e53af5d3dd89f6d59e7f786773f64d99c72024387d
font_01_sfnt_off00006985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6985 19592 bytes
SHA-256: 2ab8078e0670d6595fd1b388b85902b66214ef25915f5af9734023ae947b3252

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