Malicious PDF — malware analysis report

Static analysis result for SHA-256 d510f295459d7211…

MALICIOUS

PDF

46.6 KB Created: 2021-06-08 22:57:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e2f41398cce56f1be85f46496b61342d SHA-1: bb2e5b858d67b55b6d376a84736fb59933509748 SHA-256: d510f295459d7211a04d98d3a6e8edf53165a7c74daa0814eb172060c03ea6d0
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a link. This link redirects to a website offering 'free generators' and 'game hacks', indicating a phishing or scam attempt. The document also contains embedded URLs that likely lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/robux-hack-little-obby-studios-game-hack In PDF document text
    • http://library.atim.ac.id/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/oginject-co_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/mcpe-download_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-cheat-no-download_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-roblox-accounts-with-robux_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_004_off000051c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C1 27836 bytes
SHA-256: 395cc3fa277e43692bc1a3836c4a78dc98c588622b9452c3dd4656795d7a44e4
font_01_sfnt_off00009188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9188 18900 bytes
SHA-256: 2fd36d0051a7c815bcf58ac5bd3b967973c892cf0d0e0de48414608fa8e211b6

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