Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b87556b472ad10…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 16:21:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 016ecb2986addc5cda356faae47d09f4 SHA-1: 30f4839b10bd1f39097fa7dd374dcf936abec196 SHA-256: c5b87556b472ad10a3ade34a0cedbdeae074a32fe78f79d50528b431a20cee46
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, designed to lure users into clicking for game-related cheats. The primary link, http://netcdn.tw/app/406889139/free-spins-on-coin-master-link-game-hack, is associated with a "free generator / game hack" lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt, likely leveraging social engineering to drive traffic to malicious 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/free-spins-on-coin-master-link-game-hack In PDF document text
    • http://www.tdbaska.hr/files/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux-hack-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/roblox-how-to-get-free-accses-to-welcome-to-bloxburg_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/best-way-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-phantom-forces-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-noclip-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-home_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_off00002f66.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F66 23268 bytes
SHA-256: 60f6d5b48c3863e7f8f43ecf8b1242eaceacb97289d1e4aa809f56b3f0269f04
font_01_sfnt_off000063ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 18344 bytes
SHA-256: e8d74cdfafe168009f9dc4b70b31a19d6777835fd11eed0a51de0eb2e067c79b

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