Malicious PDF — malware analysis report

Static analysis result for SHA-256 c138c3da7d1e1a21…

MALICIOUS

PDF

34.9 KB Created: 2021-05-23 00:10:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a8e9d9893ba5e88e3c6fc8a16fc2b21a SHA-1: f7cf5982256592d2f2762ee832dc95347202fe3a SHA-256: c138c3da7d1e1a2183a0e1c1c9bf1347313c3502c27dace09dbab39d4763ee93
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks" for popular games. The document body explicitly mentions "Free Tiktok Coins" and "CLICK HERE TO ACCESS TIKTOK GENERATOR", reinforcing the lure. The primary malicious URL is https://netcdn.xyz/app/835599320/free-tiktok-coins-game-hack, which is flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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 https://netcdn.xyz/app/835599320/free-tiktok-coins-game-hack In PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/tiktok-free-like-and-followers-apk_GM835599320.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/moonactive-coin-master-free-spins_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_off000031f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F7 24604 bytes
SHA-256: 1fca057594f90439d66391682cdfd1bfde7402de3f2190e346225798f3a7a0ec
font_01_sfnt_off0000695f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695F 17456 bytes
SHA-256: af63c3f67091ff5b4163c7a95634870b81efad78e40c2266e63b82bf422718e0

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