Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6683e03aa04577…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 10:26:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 85acc66c49970fd0299c07b88be2eeee SHA-1: c925ecdebe993156fba331b883d1632f14b3e464 SHA-256: 0b6683e03aa04577b93b720c090e0f367292dfffb5a15ffdcae7e7a32d6a8111
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a game hack redirector lure, specifically pointing to a URL that promises unlimited spins for Coin Master. This, combined with the ML classifier flagging it as malicious and the presence of a visual download button, strongly suggests a social engineering attack. The primary goal appears to be tricking the user into visiting a malicious URL, likely to download a second-stage payload or engage in further phishing.

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/406889139/coin-master-hack-unlimited-spins-apk-game-hack In PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/blacksburg-bloxburg-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-on-mobile-android_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-tiktok-emails_GM835599320.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-hacks-jail-breal_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-roblox-swords_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/cheat-bar-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-roblox-admin-commands_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-face-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_off00003377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3377 22912 bytes
SHA-256: 43755df0fa1621a6854c9a5552bc3aee7abe3522068d4100b7391856f1c4e694
font_01_sfnt_off000066ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EC 18876 bytes
SHA-256: 9ae5964c59c7b5357b8ce870d7e4cb44671cda4bfec92866a7ed4d057cfe7744

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