Malicious PDF — malware analysis report

Static analysis result for SHA-256 3253d188d908e708…

MALICIOUS

PDF

49.5 KB Created: 2021-05-14 04:30:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9a977e42ac49594e6932226a491a71f0 SHA-1: 41752c1c7f7f99900fefb05e9ff41ade75fad272 SHA-256: 3253d188d908e7083489b4a9fa059c9c8a24a39950b7168dd0636b54d729dcb5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text that promote a 'free Robux' offer, a common lure for malicious downloads. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and content point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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-games-game-hack In PDF document text
    • http://matweb.pl/images/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://matweb.pl/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://matweb.pl/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C8 25652 bytes
SHA-256: 8bc51dcffd0aa939e7278b1d6742b5ca43c5ef849a00afaf559ee3d7458a69a9
font_01_sfnt_off00008371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8371 8236 bytes
SHA-256: 37b98aa1235d114ccecb120eadaccc3d2239d20e12bcc420691c5835cc3c74e0
font_02_sfnt_off00009ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EBC 18500 bytes
SHA-256: 50954281d46d1092d2c36c5fba9e04257001c8c7e5b0c8732206987489559ecb

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