Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a7475f84d2ed4a…

MALICIOUS

PDF

45.9 KB Created: 2021-05-17 16:48:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e8a91bd42bfa850fdd5f44c42690177e SHA-1: 53da32a8f526f226273f2e484a626ec2e5b36269 SHA-256: 55a7475f84d2ed4a5794a1571fc43814bd780eb8b6c71aef38d67b2ee114e018
142 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a prominent lure for game hacks, specifically targeting 'Coin Master' and 'Roblox' players. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document likely attempts to trick users into revealing sensitive information such as private keys or passwords. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/coin-master-rare-cards-hack-game-hack PDF link annotation
    • http://xn----7sbq6amdnuk.xn--p1ai/images/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/coin-spin_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://xn----7sbq6amdnuk.xn--p1ai/images/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a59.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A59 26856 bytes
SHA-256: bc05e03f2d6acdf3c3124f1ee5e4407bc2bab7925253ad0b9e708b0920b11622
font_01_sfnt_off0000888b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x888B 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off0000922d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x922D 17888 bytes
SHA-256: 3bcd7f88e9aff6a3f00dfa05e6d37dfcb1a17a5992fabfc54377b1f82d15f42c

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