Malicious PDF — malware analysis report

Static analysis result for SHA-256 a107aae3f1de4619…

MALICIOUS

PDF

48.9 KB Created: 2021-06-07 11:34:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dbf3cf460e859b3be09f962da8135830 SHA-1: a9d48cbc6515c52bbb32a78d9effa6fffde0cc7f SHA-256: a107aae3f1de4619b4e40bf7e7a0b68fb5048777723d380a53a428e8361f81d9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The primary redirect URL is 'https://netcdn.tw/app/431946152/hack-with-script-roblox-2021-game-hack'. This lure is designed to trick users into clicking through to potentially harmful content, likely as part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple malicious redirector links and the 'free generator' lure strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/hack-with-script-roblox-2021-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-free-skin_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coins-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-and-tickets-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B4 25320 bytes
SHA-256: 2f9f60de251ae6b68e0695e7160a2c9064f8cf16d68f36b0b0e236b220c25416
font_01_sfnt_off00008e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E93 2984 bytes
SHA-256: 2df87bbe4e27b27e34c872c092d0522acd977d05f5cbde7ed5e1fdfeb59cb318
font_02_sfnt_off000098e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98E1 19348 bytes
SHA-256: 569fe64ac61322d484690298451ee9fd6ae85aa6ba8602ae03368b3c6bcb1c3e

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