Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fd5c114beee75c…

MALICIOUS

PDF

42.5 KB Created: 2021-05-18 01:00:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 034981fcd9bb49127145d0a39e4d53c7 SHA-1: 242d38a9c588f214146ec0f564d7c4b79409dfcc SHA-256: 55fd5c114beee75c9fb66539c24818af3968dfb9beec137a632135adee42db67
200 Risk Score

Malware Insights

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

This PDF file employs a lure related to game hacks and free Robux, impersonating the brand eBay to trick users into clicking malicious links. The primary link, https://netcdn.xyz/app/431946152/promo-code-free-robux-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or redirect users to further malicious content, likely involving client-side execution.

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/431946152/promo-code-free-robux-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/promo-code-free-robux-game-hack In PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/daily-free-spins_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/robux-gainer_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-free-spins-link-download-ios_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_off00004748.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4748 26596 bytes
SHA-256: c74b4ef5fd58133e0138509371c880437fd3a0079af20bfe7aa43c0623a3fa50
font_01_sfnt_off00008313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 18604 bytes
SHA-256: fae8de94881284cdc44c9362006b897f1f4497b391b3b7f58f5f102f73a0fd89

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