Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7415ab8a0199b84…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 23:31:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b6b6acde9b888d6f4c585b6688cf7bbb SHA-1: 44b4051140677c28fe9c75ce6c47e87b436086b1 SHA-256: c7415ab8a0199b84cb2f0ebc47cb4fd105b7c684a8ce6bc101971455797419fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded URLs, with a primary focus on a link to 'netcdn.tw' which appears to be an application download. The document body and heuristic firings indicate a lure for free in-game items or currency, suggesting a social engineering tactic to trick users into downloading potentially unwanted or malicious software. The ML classifier strongly supports the malicious nature of this PDF.

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/406889139/free-spin-coin-master-new-link-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-city-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-ninja-legends-free-vip-server-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-jailbreak-teleport-hack-download_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-admin-hack-gui_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-sad-cheating-story-lbert_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-promo-code-for-blox-land_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/speed-hack-roblox-download-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/animation-pack-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-highschool-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/rbx-gg-free-robux_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
stream_002_off00003198.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3198 22684 bytes
SHA-256: 35e25243e1998bd46aee16962a4e0b6d7813ed75a7671f115ba0564cb4f536a2
font_01_sfnt_off0000645f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 18508 bytes
SHA-256: d7ed6df79d715ac8ef9aa6c406a3d40a3a305f21fbffd98244eb1bf6171f6987

Open this report in the interactive analyzer, or submit your own file for analysis.