Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3a34ad5aed5664…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 14:31:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1116a10f329a024828012c3bc9de1079 SHA-1: a38920fef04f30602849eeb99231be5b4655a68e SHA-256: ac3a34ad5aed56642d176338dd0241be9abb9bc830ab2a302135a95abf526b2b
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure related to free game currency and hacks, directing users to external URLs that likely host malicious content or phishing pages. The presence of a 'password-protected archive' lure suggests an attempt to bypass security controls by encrypting the payload. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious workflow designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/431946152/free-promo-codes-for-robux-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/earn-rbx_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-roblox-premium-for-free-2021_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_off000052af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AF 24400 bytes
SHA-256: 152f20f2fefc8697f4fc7cb2bf7fbd24c9f088d09d6ef1ff8b45c291556ef3e4
font_01_sfnt_off000089ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EE 18604 bytes
SHA-256: f71c03fba91376071fb946d88a6d16afcc2c6d61aa4ef632c3571b6200829f5d

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