Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38961b36789cad3…

MALICIOUS

PDF

42.9 KB Created: 2021-05-18 00:33:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 62615f2ae183e2e980e3bdeed078b146 SHA-1: 7823fbffef2d14aed803db4948bfb028e3bd4568 SHA-256: d38961b36789cad39438130d01a1fa1bc31de4b9b61bd73d3505925eae8dc391
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free coin master link' and 'game hack' generators. The document body and embedded URLs strongly suggest a lure to trick users into visiting potentially harmful websites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-coin-master-link-2021-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004913.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4913 25988 bytes
SHA-256: a3b86fe1040eb0fe9a80779714a10fc8d56205b1c9769f2d3a655cf6e265cd64
font_01_sfnt_off00008530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8530 18284 bytes
SHA-256: 15cbb039240871f663533138b429172a54e714a7a81015087603783b9c5e24ba

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