Malicious PDF — malware analysis report

Static analysis result for SHA-256 209e208b893ccd9c…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 01:01:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ba55022d43310270fb19b0042f4e4ef9 SHA-1: cf4970201bba00d30cd2884f0bed787bdab728a8 SHA-256: 209e208b893ccd9c46d226f4cf41fb545dab959ad25d5c8d56fede9afe7ecdee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document body and extracted URLs indicate a lure for free Robux, a common tactic for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, suggesting it likely leads to a malicious second-stage payload or scam. No scripts were extracted from this sample, but the presence of embedded URLs points to a potential download or redirection attempt.

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-give-away-everyone-will-get-robux-proof-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/best-free-roblox-faces_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/caught-my-girlfriend-cheating-on-me-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-client-we-are-devs_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-code-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-2-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-fix-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-recompense_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_off0000302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302F 22068 bytes
SHA-256: 4a999e16c95d46002b1725355b4f1284f04d29b3054761490d061de47e5eab91
font_01_sfnt_off00006129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 19636 bytes
SHA-256: 97ef633fd2dd02c6fe8df85f9ee2d4de9a18ec3e9959bc97f4e7ed42e323cc46

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