Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e5b90de5b38a81…

MALICIOUS

PDF

46.7 KB Created: 2021-06-09 09:21:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e92bfe31e10419db6950bf31eec7eff9 SHA-1: d185482bb76b0fac115760358ed218ddf8a103f5 SHA-256: 18e5b90de5b38a81306dfc2f201e86483c650b892f98f3351002e5e2efaccb21
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as 'game hacks' or 'free generators'. The primary lure is for free Robux, a common tactic for phishing or malware distribution. The document body and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/how-to-get-fast-free-robux-on-roblox-2021-game-hack In PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-account-been-hacked_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/cpbildco-robux_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_004_off0000541b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x541B 27172 bytes
SHA-256: 34b735fdc9ae581ced4c446a1675ef8f39db79f1a772749231cd83e23041f4dd
font_01_sfnt_off000091fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91FA 18988 bytes
SHA-256: 34729662c9f264f904f484b1d99d7aebd33fe74dc2bf1974db29f6b29f6790dc

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