Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eb247bd403fb70…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 06:21:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b5e292db129e182ff026b1baf4a360ff SHA-1: eb03917ac208a4422ab68951e83a99b3d3ae0b9c SHA-256: f1eb247bd403fb70673867775b1ffc1b742945cffbe6355fd09dfd831d1277a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URL that points to a "spin-link-game-hack", suggesting a lure for users interested in game cheats or exploits. The ML classifier strongly flagged this PDF as malicious, and the presence of an external URI further supports a malicious intent. While no scripts were explicitly extracted, the overall structure and embedded URI indicate a likely attempt to deliver a secondary payload or redirect the user to a malicious site.

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/spin-link-game-hack In PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/cheat-engine-64-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-games-that-will-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-hack-roblox-website_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/freemobile-360info-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-work-at-a-pizza-place-moneyz-cheat_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/robux-rewards_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-developer-product-ids-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/black-hair-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/does-free-robux-eu-work_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-spins-for-free_GM406889139.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_off0000324e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324E 22884 bytes
SHA-256: cb319261a2ab118a742bd2f98fdcc875ba75f677c436879707a7e2429c088bd8
font_01_sfnt_off0000658b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 17936 bytes
SHA-256: 291a6753fc2367f8404d431bd18a2520f3a8298b5d66733df321c0bb6f83edb8

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