Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cff4d59d2b4208…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 07:38:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8bcd6b03c490e6bdfee0e55e84a4b464 SHA-1: ecaffb1aa150d25be6b205d94fbee27383e9d4c3 SHA-256: 85cff4d59d2b420898c55a0fc2db60d77e9ed724016d73dfb36ddfd82f7369ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector. The document body and embedded links suggest a lure for free game currency or accounts, a common tactic for phishing or malware distribution. The presence of multiple redirector links indicates a strong intent to direct the user to potentially harmful content.

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.online/app/431946152/free-roblox-account-generator-with-pin-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-dumb-brothers-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/pokemon-go-free-3-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/pokemon-go-free-incense_GM1094591345.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/change-roblox-username-free_GM431946152.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_off0000533e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533E 25984 bytes
SHA-256: 6d2d3ca79c970ccc0b46c213ab878f399f74fc130784954cf1ef6b2e1029039e
font_01_sfnt_off00008fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE1 19060 bytes
SHA-256: 7200aba3c73ac4b0b170e2e3b8ec3d5033def010d03247ff48ab06dabefc6fed

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