Malicious PDF — malware analysis report

Static analysis result for SHA-256 66011d6cfa02113a…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 05:55:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cbe1a0f40765d93291601a8bb45d0cdf SHA-1: 77459c459e93124240b5744626ce8140b3344122 SHA-256: 66011d6cfa02113a6e62f22860a32bff01e8e9ef203714dff5ff96ea1258ddbe
200 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'free generator / game hack' to entice users. It presents a fake CAPTCHA or human verification prompt, a tactic designed to trick users into clicking malicious links. The primary malicious link identified is https://netcdn.online/app/431946152/games-that-give-free-robux-2021-game-hack, which is associated with known malicious redirector infrastructure.

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.online/app/431946152/games-that-give-free-robux-2021-game-hack In PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/100-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/how-to-get-free-outfits-on-roblox_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_off00004fdc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDC 27344 bytes
SHA-256: 440ea6de13a5526d607245ad4e622d1854cd6b45dc8fbb854819384ce86f68fb
font_01_sfnt_off00008f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F86 19408 bytes
SHA-256: 24bde8a058b9df0cf3370f0e406dee293dfb3410717d784fa2e586af54c1b53b

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