Malicious PDF — malware analysis report

Static analysis result for SHA-256 f385eb194f944ddf…

MALICIOUS

PDF

42.8 KB Created: 2021-06-09 17:43:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dc49695ab75ef1ffb0a49e72642e41f6 SHA-1: d3d652ecc6cf9b4949c7eaf4918cf535510a78a0 SHA-256: f385eb194f944ddf95e5fb0e42bfba87777dd4103dde3d3d98dcbd207a06f28c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to malicious redirectors, disguised as "free generators" or "game hacks" for popular games. The primary lure URL, https://netcdn.tw/app/431946152/free-roblox-downloader-game-hack, is designed to trick users into downloading a payload. The presence of embedded links and the ML classifier's high confidence score indicate a malicious intent to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/free-roblox-downloader-game-hack In PDF document text
    • https://gryps.de/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • https://gryps.de/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/spin-and-coin_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • https://gryps.de/images/free-spins-for-coin-master-2021_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_004_off00004b12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B12 24480 bytes
SHA-256: 024110360162f3dfe2b681091c6806dd082d2cc0579238326f02cd1c0f1a420a
font_01_sfnt_off00008355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8355 18680 bytes
SHA-256: 0c0e9e287557034d2f4138d4848dc62ca5008c9aa0d9778e35d8eae825b8d12e

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