Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdec430c963ee090…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 13:37:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 825c8fd1e1aa5f1a6079762896c85de9 SHA-1: a9f03625e12f79ad651b113e7a990c77a40e72ff SHA-256: fdec430c963ee090e13ed7bc8f8c425a5288f6813f5725ade94d68a419364ee7
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, disguised as a lure for game hacks and generators. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a call-to-action phrase reinforces the phishing attempt. The primary IOC is the redirector URL, which likely serves as the initial stage for delivering a secondary payload.

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/479516143/how-to-install-minecraft-for-free-on-ios-game-hack In PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/robloxhacks_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-google-play-free-items_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-do-i-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/i-got-hacked-in-roblox-lost-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-promo-codes-2021-june_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/robloxcom-free-skin_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/add-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-free-clothes-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/lab-experiment-cheat-easy-roblox_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_off000033f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F6 22632 bytes
SHA-256: f62049450c022f1b1f063578de8c62b24ee74e6eaa51db80376fee5e668e57ad
font_01_sfnt_off00006671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6671 18236 bytes
SHA-256: cba65744f6023630f7311c2b4bd519b673a5f0450d6bb7a8c935eaa4ac90cea4