Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2f72a309ae9f10…

MALICIOUS

PDF

32.7 KB Created: 2021-06-26 06:09:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 55e503d96a745569af1b4cb077d058d6 SHA-1: 09c563fefa3199c95c8b391959727b8d86d9d19a SHA-256: bb2f72a309ae9f10d7a4e21fbce0bf293b5139fd4f94eb4de1d6e27366b77a2c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, promising free game currency or hacks for popular games like Roblox and Coin Master. It contains multiple embedded links that redirect to malicious infrastructure, specifically http://netcdn.co/app/431946152/free-roblox-acount-genrator-game-hack, which is flagged as a malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-roblox-acount-genrator-game-hack In PDF document text
    • https://www.cow-style.com.tw/upload/files/game-on-roblox-where-you-protect-computers-from-being-hacked_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-robux-hack-2021-pastebin_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/freer-tiktok_GM835599320.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-shirt-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coins-master-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/getbucks-free-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/robux-no-human-verification_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
font_00_sfnt_off00002a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A08 22356 bytes
SHA-256: a46b116a9cb05f631bf7ec5081fd7b47f82e680ec97f5b91495246282be82a1e
font_01_sfnt_off00005ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 18896 bytes
SHA-256: bb9e6463d1c81a2a547d1690b1a8e73c4c12e3f7068d53863442e88dfdb98424

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