Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa79f8175677ae8a…

MALICIOUS

PDF

42.3 KB Created: 2021-05-18 03:22:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 78dd06db4b0236cbaf8eff173365aa92 SHA-1: 4a40278d2c29469df8bcefd23581e48f7f851e87 SHA-256: fa79f8175677ae8acab996b152e0c53dcdc15efddcb18cfb51dd13339fa53554
102 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, primarily offering 'game hacks' and 'free generators' for popular games like Coin Master and Roblox. The ML classifier and PDF heuristics strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, contains references to these lures and the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-coin-master-hack-game-hack PDF link annotation
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/rbx-com_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/master-coin-hack_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/robux-generator-without-human-verification_GM431946152.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_off00004bb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BB0 24712 bytes
SHA-256: c1e80bb01ad383be259a0b5051b4e8fba2feb1d667f3dd8095e51b87f20590e4
font_01_sfnt_off00008472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8472 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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