Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea89310b4b25bbb…

MALICIOUS

PDF

41.6 KB Created: 2021-05-17 04:00:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 72ffe7a91ead81a5794663fc75bbc039 SHA-1: 5f1ce3e29cf3e54a96e6b70034baf6b03647e72e SHA-256: 4ea89310b4b25bbbe52a73d7875762d35e28c3f7a2c73142856ab380452fcabd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures for popular games like Coin Master. The document body and heuristics indicate a clear intent to trick users into clicking these links, likely leading to further malware downloads or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-2021-today-game-hack In PDF document text
    • https://brainpads.com/images/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/where-can-i-get-free-coins-for-coin-master_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_003_off00004886.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4886 24212 bytes
SHA-256: 113d30c8e68ad61e69a763b3ea8c8c1abc9e3c33197e5e56c3a37328ec6ada9f
font_01_sfnt_off00007e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E96 18812 bytes
SHA-256: 705c5903f824403b328e8e9dbd2ab52a650d097fc3c0d4bbd34be772086d041a