Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a2cde9a6b4da17…

MALICIOUS

PDF

48.9 KB Created: 2021-06-07 12:41:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8646247f014bdba4558a09ad06995e11 SHA-1: 19646a3d6f6455b5fe71526d04e6975b8dfcca0d SHA-256: 32a2cde9a6b4da1781457e205918623dfbf7d2e50e020c1f85765f4864fc6b22
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/her-roblox-acount-got-hacked-game-hack.
  • 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.tw/app/431946152/her-roblox-acount-got-hacked-game-hack PDF link annotation
    • http://www.alpaca-buitensport.nl/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/rbxdemon_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-really-works-2021_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.alpaca-buitensport.nl/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FCA 27228 bytes
SHA-256: e666d7012909f2d611b6f4dc6af12dfab7d63fd9eb0bde7b4417bdb87882b4b4
font_01_sfnt_off00008ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED1 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B79 18600 bytes
SHA-256: c6cd0283adf47dce42bae8cbfa8f81cc5b3f9fc2b5ed2e1f88c064801bbe402b

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