Malicious PDF — malware analysis report

Static analysis result for SHA-256 8515fc04606ef078…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 00:44:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7d5bd51cf692151206e18cc887cb8050 SHA-1: d1861e1646547e585d1c752162440af959194617 SHA-256: 8515fc04606ef0789bd61bda859cd6da703c086aea37c2faddb5c9a092599cd7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, masquerading as offers for game-related cheats and currency. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-robux-discord-ggroups-game-hack In PDF document text
    • http://killebergsridsport.se/images/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/roblox-rules_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-live-now-2021_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/774-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/roblox-all-gamepasses-for-free_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-coin-master-spins-2021_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_004_off000052c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C4 26288 bytes
SHA-256: c587dd81dab71db83e44261bcb0cab7d262c91ceb70f92fab5fa70996ff60dd2
font_01_sfnt_off00008ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED8 18940 bytes
SHA-256: 127562a80f8b9b49bb812d5f6d0723427ffba663fdeb1f40bc3ce4bf2a74682b

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