Malicious PDF — malware analysis report

Static analysis result for SHA-256 e884b3acc083fbaa…

MALICIOUS

PDF

35.3 KB Created: 2021-06-27 03:58:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 05a93e661ec50c0eccf216972c1513e3 SHA-1: 093514d555cd1505d0f1ab120e14995799c7c0d3 SHA-256: e884b3acc083fbaae8ffb9a1fc93292a518befbb24a16769a54d63bea1ecde40
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a lure for game hacks and links to known malicious redirector infrastructure. The document body explicitly mentions 'How To Get Free Robux' and includes the malicious URL, strongly suggesting a phishing or scam attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.co/app/431946152/how-to-get-free-robux-that-is-real-2021-game-hack In PDF document text
    • https://www.kaojen.com.tw/upload/files/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/well-hack-net-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/youtube-have-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/happymod-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/pokemon-go-free-roam-hack_GM1094591345.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/robux-sign_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-robux-for-real-2021_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/pokemon-go-free-promo-code_GM1094591345.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/nocliping-hack-for-prison-life-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_off00003312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3312 21840 bytes
SHA-256: c40908e6923cd66d352b063bd9a3147c84ff8bdadd9189f8c84858b66434975f
font_01_sfnt_off0000630e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630E 19624 bytes
SHA-256: 3866fd73c450a856d7d8a76d04a3ba73792a69625f8766b723f670fb51064a55

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