Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e8bf50f5fde20…

MALICIOUS

PDF

42.0 KB Created: 2021-05-17 04:02:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6b5c536337175e7af37c3b38d0b0fa80 SHA-1: 87f76f86188b589af8f0083936767e068a217857 SHA-256: 8d3e8bf50f5fde20779e11291042b8f6ef0ca3254a154b13135c0fe31d164193
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external links and a high-confidence heuristic firing for a 'game hack' lure, indicating a phishing or scam attempt. The document body and extracted URLs suggest the lure is related to obtaining free in-game currency or hacks for popular games like Coin Master and Roblox. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/free-spins-coin-master-ios-2021-game-hack PDF link annotation
    • http://kalaydova.com/images/coin-mster-free_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://kalaydova.com/images/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://kalaydova.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/how-to-get-free-robux-youtube_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
stream_003_off0000499a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x499A 25072 bytes
SHA-256: 088eed26670bd05b01bb5b8dfa348def456d8b79bec3b2ee766c9919a9c49efb
font_01_sfnt_off000081c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 18288 bytes
SHA-256: 33dea10a5a633473ad7171de371eb5bee55008ca682d385727c80e9101e9f1e4

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