Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cd5649b160e4d1…

MALICIOUS

PDF

34.8 KB Created: 2021-07-08 16:57:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6f93661a2828dc67c3044f0316234fe3 SHA-1: 6ad29b3fd2f64e0e0d88b72a006f77c436c9ae31 SHA-256: b5cd5649b160e4d1a670d16035118e242b5bcaf5c3ca396afc84acbf9254a66c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and currency generators to entice users. It contains multiple links to malicious redirectors and further malicious PDF files hosted on external domains. The primary malicious URL identified is http://netcdn.tw/app/431946152/what-do-roblox-points-do-game-hack, which appears to be a known malicious redirector. No scripts were extracted from this sample, but the embedded URLs and heuristic firings strongly indicate a phishing or malware distribution 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/431946152/what-do-roblox-points-do-game-hack In PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-invite_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/wurst-115-2_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-redeemable-robux-codes_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coun-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/download-roblox-free-windows_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/roblox-the-quarry-fire-crystal-hack_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/roblox-hacks-for-booga-booga_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/hack-free-spin-coin-master_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
font_00_sfnt_off00002fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBC 22452 bytes
SHA-256: 9f3abc003edf891d9044b836073c036fabe004413fe7685378636992ad49770d
font_01_sfnt_off000061ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 19396 bytes
SHA-256: 973ccab729b01203ee59feaca07c871b44131ad73a0d20edb39373357cce7c1b

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