Malicious PDF — malware analysis report

Static analysis result for SHA-256 923da9dc834ca621…

MALICIOUS

PDF

47.2 KB Created: 2021-06-08 10:29:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b1d5a052efd6ccb932bc175691dd1ee5 SHA-1: c5cbf8113eae1b471f5bb341b70106aa4ceb56e9 SHA-256: 923da9dc834ca62166ca6a1dc9f19adb202b8cc5bd79b9e6f26e09159336fe6f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free Roblox accounts and Robux, directing users to external URLs. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs suggests an attempt to download further content or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/free-roblox-accounts-2021-bugmenot-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id//repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-surf-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/goose-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/insta-kill-any-player-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/robux-free-co_GM431946152.pdfIn PDF document text
    • https://rblx.landIn 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_off00005337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5337 28712 bytes
SHA-256: ecd1e7863172745c7a30a52722281a14b91b2cc415f46ff6c50195e3f58579df
font_01_sfnt_off00009361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9361 19144 bytes
SHA-256: 89f5bebbc3f7cbe4072fa23b349099576d3ab9457ed1f30b48e326d86d549fcd

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