Malicious PDF — malware analysis report

Static analysis result for SHA-256 433274d97b7f0801…

MALICIOUS

PDF

41.4 KB Created: 2021-05-10 14:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9b06c6e66afb60390f4e2597be057bd1 SHA-1: b92b8b1a2941f1bfeacdadd35c5b403f67320f88 SHA-256: 433274d97b7f08013d50d9245a93c4c72fa669505bd4ea542bdc547a3e8bbf2c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'game hack' or 'free generator' lure. The presence of multiple redirector links and the ML classifier's high confidence indicate a malicious intent to lead the user to a harmful site. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack, likely a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coinmaster-twitter-game-hack In PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/claim-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/master-game_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-no-download-hack_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
stream_003_off00004869.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4869 24556 bytes
SHA-256: c6fa2cb07c2d434bf25f30b66de4124e7631f349afb1debbf56052cdda9d7fb8
font_01_sfnt_off0000803b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803B 17968 bytes
SHA-256: a7d3fffb70a4648b1058189e3765bccd454023bd20bb72441abfe005f4b328a8

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