Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8ff99883b57523…

MALICIOUS

PDF

42.4 KB Created: 2021-05-13 03:13:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 93b321526e859347e11562b1ebd839b1 SHA-1: bc0199a0059340171dd9d6f02c7c46f4cd955fee SHA-256: 9a8ff99883b57523eb32190531ea7d9ac91327e2b30c58a3df9d0cf726882746
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to websites offering 'free Robux' or game-related cheats, indicating a lure for potentially unwanted software or phishing. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the document's theme suggest an attempt to redirect users to malicious content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-discord-game-hack In PDF document text
    • https://www.insol-europe.org/uploads/files/files/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/mistplay-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/earn-robux-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AB 25768 bytes
SHA-256: 0782258b05b95bfabefe01aeb6a9e638895efbde561334b2ee3ec30f5872b2ec
font_01_sfnt_off000082f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F2 18476 bytes
SHA-256: bd0365f7f2eefd731cbfcd90ede0e91cb43578b4b980f4195e4871e1034addc2

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