Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b86cd47b63a6da…

MALICIOUS

PDF

47.7 KB Created: 2021-06-03 09:14:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9629f222658cbb9e83f5222a53b9ac87 SHA-1: 480155674c31b5213c84790144fb0a2414774c8c SHA-256: a1b86cd47b63a6dae9c408702d68e4069f358a2cd11a19497e94dbbc29668838
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a prominent link to 'netcdn.online' disguised as a lure for free in-game currency, a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent, likely to redirect users to a phishing site or initiate a download. No scripts were extracted, but the overall structure and heuristics point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/link-for-free-coins-in-coin-master-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-bonus_GM406889139.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_004_off00005017.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5017 28404 bytes
SHA-256: f9e5e5ad0eee4134236705db4c22e625b9ed0cfde70d5e49535a64d30e4d07b5
font_01_sfnt_off00008f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6E 2820 bytes
SHA-256: e5f6ec650849eefe6bc6a1649c2875ce35328d23e4196945bba66cc43e5a49d4
font_02_sfnt_off0000990c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x990C 17880 bytes
SHA-256: 2ba4049ee856ee16a7338789b9de70a28ae5aa09727d52a30852826d07af8f7c

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