Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef86a62991fa7d3…

MALICIOUS

PDF

33.8 KB Created: 2021-07-01 17:32:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: effd6daf2b97b95f6736dd1e800c5b5f SHA-1: 9b41b4c5cde92249c5b82722745d09bf0d512298 SHA-256: 5ef86a62991fa7d3b66f97adc46a393a9b90087e3b984e3ace8525404f88ddef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to a known malicious redirector, disguised as offers for free game currency or hacks. The document body and heuristics indicate a lure to trick users into visiting these malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/free-robux-tips-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-wild-savannah-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-form-studio-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-robux-hack-download-free-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-fire_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-link_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-download-pc-hack-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/guest-roblox-face-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/blox-fun-info_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_002_off00002d62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D62 22376 bytes
SHA-256: 256579a2e787a2aca4c5d8a31e81261d2b27942cd3ba0fbacd9fff430efccfe2
font_01_sfnt_off00005f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F17 19012 bytes
SHA-256: 22de6c6c49620a5b43d9b779242a155e27852281398c64571dc3e0baed51394f

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