Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a8bfcd120a901f…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 12:51:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c852a897f14534ba704d2ce855dde2a SHA-1: 17b716c9ea8ded660890d526fa1281eef4379d8e SHA-256: 11a8bfcd120a901f056cbaeb28732963079c35975a5e873d9db5412ebe703b33
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links and text related to 'free Robux', 'game hacks', and 'free coins', strongly suggesting a lure for users to visit malicious websites. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' confirms this, indicating the links likely lead to redirectors for scams or malware. While no scripts were explicitly extracted, the nature of the lures and the embedded URLs point towards a phishing or social engineering attack, likely initiated via a spearphishing attachment.

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/431946152/free-robux-with-no-survey-game-hack PDF link annotation
    • http://www.pspmrsmkkb.com/webopac/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/hack-desert-treasure-quest-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/pokemon-go-free-spoofing-ios_GM1094591345.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-how-to-hack-a-server_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/youtube-you-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-hack-generator-2021-that-i-can-download_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-a-free-domino-crown-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-tiktok-accounts_GM835599320.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
font_00_sfnt_off00003065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3065 22396 bytes
SHA-256: 4594631fd44110a807b3d6c42441a616b7c0cc55d82819c0f9eb07890792c159
font_01_sfnt_off00006289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6289 19600 bytes
SHA-256: ca7a388806d592ab2d8315d83d492e3246b9fd008add48962cfd3e7e10a7156d

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