Malicious PDF — malware analysis report

Static analysis result for SHA-256 a521d6b4a1fedeb1…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 21:25:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 747dcfc460964c4284dd801cee17ccb8 SHA-1: f60c012b8ff53be49f06f4b965733216adbff372 SHA-256: a521d6b4a1fedeb1601bc4fea4355cb7bd1b3373770e150e3220ed7a9d240c65
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that are identified as lures for game hacks and free currency generators. The primary link, http://netcdn.tw/app/406889139/free-coin-master-spins-link-download-game-hack, is flagged as a redirector. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to direct the user to a malicious website, likely for malware download or credential harvesting. The ML classifier strongly supports the malicious verdict.

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/free-coin-master-spins-link-download-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org/repository/dragon-ball-z-final-stand-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-auto-piano-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hacks-abd-tricks-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-trial_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-roblox-accounts-with-robix_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/veil-roblox-hack-paid_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-font-free-download_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-escape-game-cheat_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/pubg-uc-zip_GM1330123889.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-minecraft-java-edition_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_002_off0000332d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x332D 22536 bytes
SHA-256: 7844d5f93e04a1451de8064de35060db30ff3c5f7720600a268947dcfc80721f
font_01_sfnt_off000065b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B7 18924 bytes
SHA-256: 27c8c61d44c060da30f6c9600d603766ffcc18b4584fd5ddfdc22e1ec1594314

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