Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71a4e788b27d395…

MALICIOUS

PDF

43.9 KB Created: 2021-05-14 21:05:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9575e0c747033ac2193b9428a1515764 SHA-1: 9e8efca999a2e595aa6fc5810bdb1f1e12905d9c SHA-256: b71a4e788b27d395346b3918638fa34d92a2e89f273a4c988c79b0bab2ad6c9f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirector infrastructure, specifically advertising game hacks and generators. The document body and heuristic firings confirm the intent to lure users to these sites, likely for further malware delivery or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/406889139/coin-master-hack-pc-download-game-hack In PDF document text
    • http://neltalen.nl/images/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000466f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x466F 24484 bytes
SHA-256: f767139006d626e5cb9d636b075e9a9fd5fd5badfe34760ec147b2e4d23dd06d
font_01_sfnt_off00007e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E94 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000887f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x887F 18448 bytes
SHA-256: 1a77b19ae755b2674c1484136c2a6f206883130a3eb8aa78e1aa84be95f9bf15

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