Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c08e1f7acf0c4…

MALICIOUS

PDF

36.8 KB Created: 2021-07-03 11:16:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 418438d563d99a32c6c35580dbd7107c SHA-1: 96f2f5bd4e872cf20f721a66051676bed1c66b98 SHA-256: 925c08e1f7acf0c4a91ea7ce727e80b41885efae131630507748a0242e7b9048
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically disguised as a 'free generator / game hack'. The embedded URL, http://netcdn.tw/app/406889139/coin-master-daily-free-spins-today-game-hack, is also flagged as malicious. The document body, though partially corrupted, contains similar lure text and URLs, reinforcing the phishing attempt.

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/coin-master-daily-free-spins-today-game-hack In PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/roblox-catalog-free-hair_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/block-best-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/prison-life-roblox-cheat-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/xonnek-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-code-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-know-if-your-being-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/hack-noclip-roblox-2021_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_off000036bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36BD 23476 bytes
SHA-256: f47ac2fd9f77e219dcec073c413f3e090e24a48dc51133cbead89d2885c0f665
font_01_sfnt_off00006bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD9 18772 bytes
SHA-256: 4c4a305a778bb5e9b4a0f91ec50405ee9a3bc35e218e3183f664239bdcba7b2d