Malicious PDF — malware analysis report

Static analysis result for SHA-256 677a8f28063c7256…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 05:26:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b668d395dab181f9a668d32b9977032e SHA-1: 77319d6708851d204efb6704237d8109a0ce9703 SHA-256: 677a8f28063c725661c8f3ca624b8bc17f8a8f46861ece950c5c1bce7f398ab6
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors and impersonates Facebook to lure users into downloading a "Coin Master Hack". The document body and embedded URLs strongly suggest a credential phishing or malware distribution attempt. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-hack-2021-apk-download-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/406889139/coin-master-hack-2021-apk-download-game-hack.
  • 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/406889139/coin-master-hack-2021-apk-download-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/tiktok-free-hosting_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/earn-robux-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pokemon-go-free-online-game_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hacks-for-minecraft-windows-10_GM479516143.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_off0000525f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525F 25500 bytes
SHA-256: c9d14b2b38d3c8acd9bc006fa1185bfb4087b8af05da56787a7c2706d131ede1
font_01_sfnt_off00008bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDA 18876 bytes
SHA-256: d7d40464d831938cfa9caec420339d0a09463e275fb7b32e55518fa26c88094b

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