Malicious PDF — malware analysis report

Static analysis result for SHA-256 b535f1ec4420df13…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 15:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1fd8c2fb76af4724006a2e7846b6d52a SHA-1: 5b31f09809ccd778dccfc0f2dd045674181c5c87 SHA-256: b535f1ec4420df1316004eba9612d3db3fe6f736810fddf94ee8913e05deecac
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a 'free generator' or 'game hack'. The document body explicitly mentions 'You Promised My Son Free Robux' and includes the malicious URL, indicating a social engineering lure to trick users into visiting a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious.

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/you-promised-my-son-free-robux-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/katchan-roblox-free-shop-hose_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/cheat-indetectable-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-packages-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/cheat-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-draw-youtube-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-easy_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_off00002d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D59 22520 bytes
SHA-256: 729f4784dc7b121b3806050ec78385765da0136ca9661ac16fb99da9a4d44de8
font_01_sfnt_off00005fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA2 19960 bytes
SHA-256: f29a7a7b71d38b505cc7d4cb2f72b745270787244330deb29ff722716c8b7989

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