Malicious PDF — malware analysis report

Static analysis result for SHA-256 5186218cecc8f298…

MALICIOUS

PDF

42.4 KB Created: 2021-05-10 16:00:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d38fd0f3b1abcbf4aeaeed20a62dbd68 SHA-1: 8c07aa156acb88a22b46903f8a1203062c39e8aa SHA-256: 5186218cecc8f29876dbc5b9fa3e38c57cfa17a7f109eb79d6df90b98fbb5322
122 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 that are advertised as game hacks or generators, a common lure for malicious content. The heuristic 'SE_FAKE_CAPTCHA' indicates the document may present a fake CAPTCHA to trick users into executing further actions. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites, likely for further exploitation or malware delivery.

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/479516143/minecraft-noob-vs-pro-vs-hacker-vs-god-game-hack PDF link annotation
    • http://bob-reid.co.uk/uploads/files/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/mcpe-com_GM479516143.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-do-you-get-free-roblox-money_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_off00004a8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8E 25020 bytes
SHA-256: 27e6bb811d5f6a1768c1930ddf4731f315471f6787870ff766cbc4c1e42c675d
font_01_sfnt_off00008304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8304 18500 bytes
SHA-256: 35163f059b41a7a3602679841a335cd83055ee85c0a72342166b4475486ea273

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