Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91376b62f3a1d92…

MALICIOUS

PDF

36.1 KB Created: 2021-07-06 07:49:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 11eb766444824a60951dc60c71bcb905 SHA-1: 22e61702a13c349d46b6efe0c1e88c058e33f9f8 SHA-256: a91376b62f3a1d924d86a5507189560bcc5d7617ba5876b010463b48bbcf36a2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, masquerading as game hacks and cheats. The primary lure URL is http://netcdn.tw/app/431946152/how-to-change-your-roblox-username-for-free-2021-game-hack, which likely leads to further malicious content or malware download. The presence of a download button lure and ML classification further supports its malicious nature.

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.tw/app/431946152/how-to-change-your-roblox-username-for-free-2021-game-hack In PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/roblox-bubble-gum-sim-free-pet_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-make-robux-free-and-fast_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/pubg-uc-bc-com_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-pastebin-no-fake_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-on-tablet-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/robux-free-join-group_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/cheat-roblox-lumber-tycoon-2-axe_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-character-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-hack-peoples-account-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/one-punch-man-unleashed-roblox-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/i-got-hacked-on-roblox_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
font_00_sfnt_off000033d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33D4 22336 bytes
SHA-256: db17ff7ce49bccaa38f45990e166566302b3d751ff85d14ce674081ae856e1ac
font_01_sfnt_off00006568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6568 19944 bytes
SHA-256: 58d5e835659902526c12094ddffc5710f83fbe2825a8f92a51b056a6b9134250

Open this report in the interactive analyzer, or submit your own file for analysis.