Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdc8e337a80e8e0…

MALICIOUS

PDF

39.8 KB Created: 2021-05-10 13:42:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9a76dbe1f16232953ed7cce3b8355dbf SHA-1: cc82eedbc7f2c613799281c0354c386c9ad49bb6 SHA-256: 9bdc8e337a80e8e04be343926fee6102c4ee64b7208ac4e369bbf4cfd33ac406
200 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that impersonate brands and lure users with promises of free game currency or hacks. The primary redirector URL, https://netcdn.xyz/app/431946152/free-robux-apk-game-hack, is associated with malicious redirector infrastructure and brand impersonation for credential phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a workflow designed to exploit user interest in free in-game items, likely leading to credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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/431946152/free-robux-apk-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/431946152/free-robux-apk-game-hack In PDF document text
    • http://cosmosdawn.net/images/get-more-robux_GM431946152.pdfIn PDF document text
    • http://cosmosdawn.net/images/i-robux_GM431946152.pdfIn PDF document text
    • http://cosmosdawn.net/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cosmosdawn.net/images/coin-master-tips_GM406889139.pdfIn PDF document text
    • https://www.cosmosdawn.net/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.cosmosdawn.net/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://www.cosmosdawn.net/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.cosmosdawn.net/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cosmosdawn.net/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://cosmosdawn.net/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cosmosdawn.net/images/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://www.cosmosdawn.net/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://cosmosdawn.net/images/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cosmosdawn.net/images/how-to-get-free-roblox_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_off00004111.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4111 24528 bytes
SHA-256: c6ffa089b529fd655c8b4656094c566db47e0742150be8213e8456326e90e0b3
font_01_sfnt_off00007966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7966 18360 bytes
SHA-256: e9359734bc9145e2b26d31ba7f580aebc3bf98c57002eb6e857d81b76a5cddb9

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