Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a144527ca430a0c…

MALICIOUS

PDF

40.6 KB Created: 2021-05-20 05:10:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c57ea075067eb751e3f131f4770bd3a3 SHA-1: 581eb1c5abcfd0dbb4e7f19f4be30adffff99811 SHA-256: 4a144527ca430a0cdd1a3af9ed7ccdaea28d5b35cc2577016455e85d95d29b13
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to 'Coin Master' and 'Facebook' to trick users into clicking malicious links. The embedded URLs, such as 'https://netcdn.xyz/app/406889139/coin-master-free-spin-link-today-download-game-hack', are identified as malicious redirectors and are likely used to deliver a second-stage payload or facilitate credential phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-free-spin-link-today-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.xyz/app/406889139/coin-master-free-spin-link-today-download-game-hack In PDF document text
    • http://viemeo.fr/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://viemeo.fr/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/como-hackear-coin-master-2021_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_003_off00004406.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4406 23964 bytes
SHA-256: 75cef6ad9a7dc8eea43bd0caa5ba3804848eb4b5655b54cacb120da5ebc68452
font_01_sfnt_off00007a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A67 18816 bytes
SHA-256: c5a160641c4edab75c60996e0f798f3e883f872898d31e041e46be69cf2ac151

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