Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c23052e1a217ab…

MALICIOUS

PDF

42.1 KB Created: 2021-05-15 12:32:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 91b13a3f8fdf1587571a387c49e9cfa2 SHA-1: d0cdd1297c1f1a020f0ce3546827804926aa696e SHA-256: a3c23052e1a217ab14916bac665f2610bb3136d8d0d2a04b83196c5f7c2c7bdd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically disguised as 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.xyz/app/479516143/is-minecraft-free-on-mac-game-hack. The document body, though partially obfuscated, also contains this URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/479516143/is-minecraft-free-on-mac-game-hack In PDF document text
    • http://bildhauerei-roerig.de/images/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/cm-spins_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/free-minecraft-packs_GM479516143.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/robux-earner_GM431946152.pdfIn PDF document text
    • http://bildhauerei-roerig.de/images/free-robux-hack-no-human-verification-or-survey_GM431946152.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_003_off00004a27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A27 25652 bytes
SHA-256: a12423a0d1ff6006269248fabdae444f01b4acad06e8f13f46c60fec4d598ec6
font_01_sfnt_off00008487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8487 17568 bytes
SHA-256: 70928c98edb580837fcbf0f9543b841edd11efdac6de6b6fcc7c93cea73d6057

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