Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bb01241d062683…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 22:30:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 92d0e029b81c39fef7c960aec98485ac SHA-1: f20b261b381fd5b17893d502290749f9092b6160 SHA-256: e5bb01241d062683d31576cfaf4b68d9ec76c68078983adb92374381772b3bf3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a known malicious redirector, specifically advertising a 'free generator / game hack' for Roblox. The document body, though partially corrupted, contains references to this lure and the associated malicious URL. The ML classifier also strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The primary attack pattern involves luring users to a malicious site via a fake offer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-get-roblox-premium-for-free-2021-game-hack In PDF document text
    • http://perpus.i2s-learning.com//repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-ban_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spin-in-coin-master_GM406889139.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_off000051d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D5 26080 bytes
SHA-256: e8e8d811b1d976def8f23496a624c4ef30ebdaffb55d7e0992b6055891aa28fb
font_01_sfnt_off00008d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D87 19292 bytes
SHA-256: f40355f8d73764334de65774b58428be6642d496c7c5bf19d3a36d7b89996382

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