Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75120b1ddda9df1…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 13:52:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 22f0ba34c8d3c1cb2205667e9d7c73df SHA-1: fc5a69c8fcf5e468ea7ef42a442ef5c18b27fa69 SHA-256: b75120b1ddda9df151d582b2e779609ebe9f1edfd174c19e2e0b9c410fa0bcc2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a primary URL identified as a malicious redirector. The document body explicitly mentions 'Free Robux Sites 2021' and 'game hack', indicating a lure to trick users into visiting potentially harmful websites. The presence of a malicious redirector suggests an attempt to download further malware or lead the user to a phishing page.

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/free-robux-sites-2021-game-hack In PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/hacks-roblox-jailbreak-descargar_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/como-descargar-roblox-hackeado-para-android_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/roblox-virus-free-exploits_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/pokemon-go-free-incense_GM1094591345.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/roblox-hacks-for-epic-minigames_GM431946152.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mb.its.ac.id/rbmb/repository/free-robux-pin-codes_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_off0000315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315D 22508 bytes
SHA-256: 3c2431367cd35c76102c26b0389cfc5f11c405822f27984fe5c8bc7d00b40bf0
font_01_sfnt_off000063df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DF 19340 bytes
SHA-256: bf872f38d37b2489c3690af0fb3a59d21ccad535cade2ac40decd632f59a44ea

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