Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e85d258936f903f…

MALICIOUS

PDF

54.6 KB Created: 2021-06-02 12:05:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d5b39c893f38a3e64183891538d11279 SHA-1: 79ff2ef2ca664c8c6392aed428193ce980a1d059 SHA-256: 5e85d258936f903f4b09de89779f935bd053c338a4ee60fc9caf1b98cb53dfce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to 'Free Robux Hack Generator' and a URL that matches the malicious redirector. This indicates a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

Heuristics 4

  • 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.
  • 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-hack-generator-club-no-verification-game-hack In PDF document text
    • http://unifieo.br/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C8 28484 bytes
SHA-256: 4872ef33c70d3fc18ce5779b586ae46a908ffbaaa33d122a7fe1eaf15d4bbbb8
font_01_sfnt_off0000979c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x979C 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000a43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA43E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 18844 bytes
SHA-256: 48fd45087d054b4d57bb31a0b324cc4880e8428f49c4031be95bf24d2a6705e4

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