Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8e9d19b6ac6314…

MALICIOUS

PDF

47.7 KB Created: 2021-06-08 10:07:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f7389ce9d0db77bf72ad4387952a9b3c SHA-1: ac36d9207b523e58483c3a28aee65af1b4f4e241 SHA-256: ec8e9d19b6ac63143bc3b180d6d334f06ee66bb50d15695695dd24f0cfe3e463
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 'free generators'. The primary lure URL is https://netcdn.tw/app/431946152/roblox-robux-for-free-2021-game-hack. This indicates a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/roblox-robux-for-free-2021-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-dragon-ball-rage-hack-mobile_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/pokemon-go-free-vs-pro_GM1094591345.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-website_GM431946152.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_off00005196.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5196 24848 bytes
SHA-256: 3621b4b21e2cbe4f37f64bd7c024308a6a9b551da479b3b461ef2ed44a4666d8
font_01_sfnt_off00008a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4B 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000096f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96F3 18488 bytes
SHA-256: f9a1e5364e694194e50cca1f381ee842257277bd9571b2face9b7725ebbf062f

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