Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa88e82e4a1db2a5…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 09:07:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-07
MD5: 95f22631248fc83e45c7ec4a046aff5d SHA-1: 616527d894d7eb9f136be1671df0c6d822b4610b SHA-256: aa88e82e4a1db2a5f956f3c6529265cd1964b3fbaf51632afa93362c975dabca
160 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-download-2021-game-hack In PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/i-got-hacked-but-i-want-my-account-back-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/pubg-uc-nepal_GM1330123889.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-skin-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/counter-blox-roblox-offensive-hack-free_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-robar-cuentas-de-roblox-2021-akakaa_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-monte_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-ccount-crcker-free-v3million_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/constructeur-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-free-version_GM479516143.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_002_off000031a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A7 22872 bytes
SHA-256: b02741cd6ae33a79be856e7ffea6c5fc4da8cdb22856713bbbdcc752971d61f5
font_01_sfnt_off000064f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F7 18988 bytes
SHA-256: 24c61ec5dda380d335f70cf248a1dbd8858f35ecf964e4cb835eae0821bc023c

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