Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7eaf50f1bae824…

MALICIOUS

PDF

36.1 KB Created: 2021-07-03 14:16:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 21aaac5fc545c323bab390940d6dba60 SHA-1: d0d6bcd14d81f691a1ad91058f77afc6621253ee SHA-256: ed7eaf50f1bae8249ba5d4342d1f97a8e81b92f82e54d8132ec7048fa09297a2
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-robux-without-offers-game-hack. The document body and embedded URLs suggest a lure for game-related cheats or currency, which is a common tactic for distributing malware or conducting phishing. The ML classifier also strongly indicated maliciousness.

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/431946152/free-robux-without-offers-game-hack In PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/counter-blox-roblox-offensive-free-skins-download_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/free-to-use-roblox-shirt-new_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/roblox-jailbreak-noclip-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/free-4l-tiktok_GM835599320.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/kazok-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/roblox-game-tablet-hack_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/robux-cheat-engine-64-download_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/hack-master-coin_GM406889139.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://uimedan.ac.id/assets/ckfinder/userfiles/files/roblox-april-fools-hack_GM431946152.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
font_00_sfnt_off0000349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x349D 22640 bytes
SHA-256: b20fd4f1b3b5c5e8d37eb0286bcd3fe4d0c5f32c2a6e5920208d4cc23a5ac9dd
font_01_sfnt_off0000674a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674A 19304 bytes
SHA-256: d28279064c80375efd82c55b38a8139998c8ec291e9a82c1a232f0005e70f64e

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