Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b83ed4cd1e463eb…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 09:45:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c1071ca9b03cd4c98392210655f0ae7e SHA-1: 87e0c9a4d35491417e69f5dbae8fec2b533af4e3 SHA-256: 4b83ed4cd1e463eba7617de02283bd8125bc42e2ec7cc84a8fec94171b86c4d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'Coin Master Hack Android' and includes the malicious URL. The presence of embedded URLs and the ML classifier flagging it as malicious strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-hack-android-game-hack In PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-map_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/pokemon-go-free-3d_GM1094591345.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-free_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-java-edition-for-free_GM479516143.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_004_off0000503d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x503D 26592 bytes
SHA-256: e5867184732778b7e35475061f466b3003b8caedfb65e0b5af107bdf6b4a545e
font_01_sfnt_off00008db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB2 17888 bytes
SHA-256: a3f3c6358bf6c689f14a31b2bec7c705949e82e1ea95935703b782b8d0a54cd0

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