Malicious PDF — malware analysis report

Static analysis result for SHA-256 3030f5a75f4a3a94…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 07:36:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ded338fd087244be04117ca3aeac479f SHA-1: 5ef99360c856ef32635044d0957e09ca4a3fa296 SHA-256: 3030f5a75f4a3a94abe1126aa4477d036a2b624f6af318567ede207e85338cb6
200 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and impersonates brands like Facebook and Roblox to lure users into clicking. The primary malicious link identified is https://netcdn.online/app/406889139/coin-master-100-spin-game-hack, which is presented as a game hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit user interest in free game items to redirect them to potentially malicious sites, likely leading to further compromise.

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-100-spin-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-100-spin-game-hack In PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/corn-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/tiktok-free-8-ball-pool_GM835599320.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-coins-coin-master_GM406889139.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_off00004cb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB3 28968 bytes
SHA-256: 734c134330cfbab04f06ddba30ff8acc1c12aed9eea4e24a74485b5df03343a9
font_01_sfnt_off00008924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8924 18000 bytes
SHA-256: 01f803363f7eeb4dce0f816621254ac49837589185e144589db73f807fad6798