Malicious PDF — malware analysis report

Static analysis result for SHA-256 2026164813c81648…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 15:51:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 96108bfada17d24b5c5c5488fdda1fb3 SHA-1: 568d90745c2741dd19ef3a4eb612304927e0df90 SHA-256: 2026164813c81648c6404d7eccf144cfbd0c2dc2fbfe0924ac39d890e80033d9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising "free Robux generators" and "game hacks". The primary lure URL is http://netcdn.tw/app/431946152/free-robux-generator-no-verification-game-hack. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely to deliver a second-stage payload or collect user credentials.

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-generator-no-verification-game-hack In PDF document text
    • http://digilib-ppsunisma.ac.id/repository/hack-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/robux-hack-with-phone-number_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/easy-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/unjailbreak-download-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-why-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-admin-hack-any-server-unpached_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-bots-allowed_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-safe-hacks-download_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-coolkid-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-promocodes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-free-robux-password-required_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/cheat-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-cheat-script-autofarm-super-power-training-simulator_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-roblox-robux-for-free-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/http-roblox-cheat-net_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_off00003174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3174 22684 bytes
SHA-256: ac284dd3528e5b36c7ef24ef44ce8396023ac6a9c58d32950fd7104231a48eab
font_01_sfnt_off0000646b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646B 19072 bytes
SHA-256: e7f1824e88bb300dfe73d0982d2e974b610cf43959a10b1d34f5500451ac8bd8

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