Malicious PDF — malware analysis report

Static analysis result for SHA-256 2138d72ec7e0c2f8…

MALICIOUS

PDF

48.8 KB Created: 2021-06-03 23:44:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e344bd5691b08d91a2d3961b853a1bc8 SHA-1: ccdc3a4f74417eee9eef38b31affb3d242f65ace SHA-256: 2138d72ec7e0c2f844cc0a396fa6a149a7ccdeed658914bb6d7ae82a5e93ceae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.online/app/431946152/free-robux-without-doing-anything-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/free-robux-without-doing-anything-game-hack In PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-hack-gui_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-free-robux_GM431946152.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_off00005292.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5292 26012 bytes
SHA-256: d16b8295f6a3b585c60730c06f129eddecda24d6081acc3498270e133f9f985c
font_01_sfnt_off00008f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3A 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off000098fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98FA 19240 bytes
SHA-256: e1e4d521198b5ef2bb2d2ba3e061f6fd747e7988b39df69dcb6ecbaf810b6a5c

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