Malicious PDF — malware analysis report

Static analysis result for SHA-256 239a7a2ac2c04d87…

MALICIOUS

PDF

36.4 KB Created: 2021-06-19 01:53:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 01b849c351b43f14d9090302fc483406 SHA-1: 7a3dcd31969650d9e7ec0dbe588447303efc2de1 SHA-256: 239a7a2ac2c04d8741c08b0daacbac2927b7c877bf6caba237354918481349a3
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for free Robux or game hacks. The document body reinforces this by displaying similar text and URLs. The embedded URL is a known malicious redirector, suggesting an attempt to lead the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself is exploited to deliver the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-without-buying-something-with-a-email-address-game-hack In PDF document text
    • http://repository.ummy.ac.id/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-paintball-level-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-redeem-codes-free-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/robuxian-hack-to-steal-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/pastebin-robux-hack-v65_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/hack-2021-roblox-ap_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/advexplore-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3677 21968 bytes
SHA-256: 26969bad55dd2ed5d975227e240c003ac2bc0a1f5aa9f019024927868c537ce8
font_01_sfnt_off000066c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C6 19992 bytes
SHA-256: b0a4f3bb8565e93582e800f5fdd84243fc43db39885bff401e333dc90f9a4deb

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