Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad52ae30cc8cdedb…

MALICIOUS

PDF

35.1 KB Created: 2021-07-20 13:24:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: acb8683d40a5fa261ea909864a3f6abc SHA-1: 47cc927a8f6db5b627f41705e1744562a69b9ed8 SHA-256: ad52ae30cc8cdedb6ccd3f1cbd2b079e0bc16e62b047e80ff4d3077e10907777
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The primary URL, http://netcdn.tw/app/406889139/free-spins-from-coin-master-game-hack, is directly associated with the lure of game hacks. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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/406889139/free-spins-from-coin-master-game-hack In PDF document text
    • https://elearning-min2jakpus.sch.id/__statics/gudangsoal/files/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://elearning-min2jakpus.sch.id/__statics/gudangsoal/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • https://www.elearning-min2jakpus.sch.id/__statics/gudangsoal/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://www.elearning-min2jakpus.sch.id/__statics/gudangsoal/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning-min2jakpus.sch.id/__statics/gudangsoal/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://elearning-min2jakpus.sch.id/__statics/gudangsoal/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://www.elearning-min2jakpus.sch.id/__statics/gudangsoal/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning-min2jakpus.sch.id/__statics/gudangsoal/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://elearning-min2jakpus.sch.id/__statics/gudangsoal/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning-min2jakpus.sch.id/__statics/gudangsoal/files/free-minecraft-java-account_GM479516143.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_off00003210.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3210 23832 bytes
SHA-256: b0a9a590cf539c3646684fd68457efc8d212f1082318b37dce54d22ceccdb965
font_01_sfnt_off000067fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FC 18148 bytes
SHA-256: a8179ab01d9f651dd6fb5ce3364ead5561884d8b40fe8a62eaf26fde05d0c646

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