Malicious PDF — malware analysis report

Static analysis result for SHA-256 503a2b9af488251a…

MALICIOUS

PDF

42.7 KB Created: 2021-05-16 09:29:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 23b3c00b7fc635eb6899403778286410 SHA-1: ab295026c4f67a301fe98722d885dcab3fa7786e SHA-256: 503a2b9af488251a65b2eb2f10f8d0146d68599904c23ae5ec9a663b1a4d96af
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, disguised as "free generator" or "game hack" lures. It also displays a fake CAPTCHA to trick users into interacting further. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-free-spin-generator-without-human-verification-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a client-side exploitation or redirection chain.

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.
  • 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.xyz/app/406889139/coin-master-free-spin-generator-without-human-verification-game-hack In PDF document text
    • http://cosver.eu/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/roblox-sued_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/roblox-cp_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/www-robux_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_003_off00004b04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B04 24428 bytes
SHA-256: 27b5d6d43eade7e2818c3f303ddd1ef84013ebdd0a64f7f0f423f478005b57da
font_01_sfnt_off00008335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8335 18784 bytes
SHA-256: 560f5148e24a3ab67e773876ce527874ae2d943094ab10326a5f2249ef84e33a

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