Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cebb2dce1a443f…

MALICIOUS

PDF

42.2 KB Created: 2021-05-19 23:04:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0bc0b219bc6314096024c2c31eb8c86c SHA-1: e5c2f520083de59481813fe125a0f41b5e158c10 SHA-256: 81cebb2dce1a443ff62a9dcfda101e7678475f9530da0d15b2f1ddec7d069f90
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, suggesting a phishing attempt to trick users into visiting malicious sites for in-game currency or cheats. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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/406889139/coin-master-game-hunters-club-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/does-pubg-uc-generator-work_GM1330123889.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pubg-5-uc-buy_GM1330123889.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-link-daily_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_003_off00004a2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2F 24632 bytes
SHA-256: 657cba1a760a79a09f1ed0f6b36b6c11756e355debe515d13bdeb805b1eefdb9
font_01_sfnt_off000082e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 18176 bytes
SHA-256: 74ffa4d131b86204091f15510d9e99a1a5fd5d4654b2a7ca9c54d403d144afe2

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