Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd14bfc6ad6be74…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 05:11:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3da391cbfbfd6ed12259558a3403817f SHA-1: 876973b8788c160a5609c5f9d391a6c35ebeba3b SHA-256: 8bd14bfc6ad6be74168a1081d25d4c455893c6817ee5cd8a989430d7110ffbc3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising 'free generator / game hack' lures for popular games like Coin Master and Roblox. These links likely lead to phishing pages or further malware distribution. The ML classifier also strongly indicated maliciousness.

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/406889139/25-free-spins-coin-master-game-hack In PDF document text
    • http://rightlead.com.tw/image/data/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/roblox-explorer-hack-2021_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/roblox-is-getting-hacked_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/how-do-u-see-if-u-r-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/download-roblox-free-for-android_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/robloxhacks_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/how-to-hack-roblox-apocalypse-rising-2021_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/get-robux-today_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/get-free-robux-real_GM431946152.pdfIn PDF document text
    • http://rightlead.com.tw/image/data/files/daily-free-spins-coin-master-2021_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_off0000319b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319B 22728 bytes
SHA-256: bb61e30f68bb3b7639f4e414d13db4618cb9c140655c536cf4f35134eff1bb46
font_01_sfnt_off00006491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 18432 bytes
SHA-256: ec79058dc3660cd38899abd0af6a529c62159de1466b2a8febb865623eb50a1d

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