Malicious PDF — malware analysis report

Static analysis result for SHA-256 256631cd0f7688a5…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 03:20:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 57dc97d94d873f3e09e7f8ffeae7f2d7 SHA-1: e6dd6788187375a82f90a5a06acab91520bf92ac SHA-256: 256631cd0f7688a5b9b8cf3da622db4910974879ad98c888e8aa55ee8ee447e4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links and embedded text that lure users with promises of free game currency and hacks. The primary link, http://netcdn.tw/app/406889139/where-can-i-get-free-spins-for-coin-master-game-hack, is flagged as a redirector and likely leads to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting potentially harmful web content, aligning with 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 high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/where-can-i-get-free-spins-for-coin-master-game-hack PDF link annotation
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/ash-shirt-only-the-free-ones-on-roblox-shopping_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-game-card-free-codes_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-builders-club-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/100-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/appsmob-info-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-hack-pro_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_off00003476.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3476 22748 bytes
SHA-256: 0577bbdd25d9af2b642c9949b9103b18092ebdd23a82e7bef5d4c59b956554b4
font_01_sfnt_off00006755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6755 18540 bytes
SHA-256: b12aa12d38c8c524e7797586759798b9ea71944b9981e44aaeae315634813687

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