Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c50a889f1f262b…

MALICIOUS

PDF

34.2 KB Created: 2021-07-08 00:17:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ad3daa47aeb490ea7fc586e153750315 SHA-1: a0d8f8b89048bb3fa7955bc8b6426bdc8314e9d2 SHA-256: 84c50a889f1f262b809912e752bf24e361802f1426961f1b2fa5e994ceb4e993
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a common lure for game-related cheats and hacks, directing users to a known malicious redirector. The embedded URL, http://netcdn.tw/app/406889139/coin-master-online-hack-game-hack, is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interest in free game items to redirect them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-online-hack-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/run-free-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-today_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-10k-robux-by-redeem-code-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_002_off00003089.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3089 22696 bytes
SHA-256: f36514bc64c1fe809c45d29b0750379291a4f8ec5966cefb48ce2a56dc039c86
font_01_sfnt_off00006385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 18080 bytes
SHA-256: fae27d4c4c2e952e6b547115e62f69cc1ea43df316298c73a3448a7f0ad6854c

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