Malicious PDF — malware analysis report

Static analysis result for SHA-256 797c98058c9dc1fb…

MALICIOUS

PDF

51.3 KB Created: 2021-06-11 05:08:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ab684d8a36605021cd1cd4a5ffc05b46 SHA-1: aa11a32396cf38d46610832cc0e48e6b3ecd6e9c SHA-256: 797c98058c9dc1fb1bf8658ae4eb2d8b453dc00ee98754136623cc202fe92986
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically linking to a 'free generator / game hack' lure. The embedded URL and the document body text reinforce this, suggesting a phishing or scam attempt to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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/how-to-et-robux-for-free-game-hack In PDF document text
    • https://foc.vn/public/upload/files/roblox-money-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/https-www-roblox-com-games-2021202180-free-admin_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-group_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/earn-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/nero-cheat-codes-roblox-audio_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/ninja-hack-roblox_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E9 26764 bytes
SHA-256: 42e5b90ba22e115d56aed3923d02837c2442a7ee7488f32cb2bcb06916dce753
font_01_sfnt_off00008ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED7 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9884 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA595 18280 bytes
SHA-256: d728a291be1991c40e85e6281253e6ce24635592e9c315a091de621b89bbd709