Malicious PDF — malware analysis report

Static analysis result for SHA-256 900213d7c16edfbe…

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 23:28:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f64c1db22d1d3e7f4cea0e8b791880f3 SHA-1: aa03a8601cec05ee75b30d6fff3cecbd6c486bf1 SHA-256: 900213d7c16edfbe1c882b11f197c8e1f1714eb0e4043346210cd5a0f8393af6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'free Robux codes' and 'game hacks', directing users to a malicious redirector URL. This indicates a phishing attempt to trick users into visiting potentially harmful sites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.co/app/431946152/free-robux-codes-2021-android-game-hack In PDF document text
    • http://library.sdkmaterdei.sch.id/repository/why-you-never-want-to-use-free-robux_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-pocket-edition-free-download_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-hair-roblox-not-decal_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-tolls-roblox-ultimate-driving_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-hack-for-more-cash-in-roblox-wizard-tycoon_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/slurp-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-draw-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/new-hack-en-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-cool-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-catalog-roblox-hair_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/robux-hacker-google-chrome-extension_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-codes-and-free-roblox-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-python-hack-scripts_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/inject-hack-app-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-give-free-reedeem-card-pin_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-spielen-pc-free_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-generator-no-verification_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_off0000303f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303F 22712 bytes
SHA-256: b9ab806b0a1a746ecfa14294d9ebb8c709b1fd8685d464b6e9d6feed4bdeb6e0
font_01_sfnt_off00006339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6339 19412 bytes
SHA-256: c65ccd2b5a0198f8019ea438872a739e6971eb8ae9016112a47f7186c9a8558f

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