Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2646517911ec6c8…

MALICIOUS

PDF

50.0 KB Created: 2021-05-16 23:21:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9b242c735f55b654d04cd4267d87a989 SHA-1: 286abb4eeba3ca48fbfa87a1d224da263adf6a46 SHA-256: b2646517911ec6c8742845b0cf59a511a78c3bb18ae9466280aaacd6ffe4cd69
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering "free generator / game hack" content, identified as a malicious redirector. The document body, though partially corrupted, also contains similar URLs. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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/hack-coin-master-mod-apk-game-hack In PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A8 24652 bytes
SHA-256: 0642f757db2f16c2f87a8255828e79e40d467b14e3b08702afab8f3afb46fc1b
font_01_sfnt_off000080d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D7 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00008cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBB 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000a146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA146 18068 bytes
SHA-256: cdfa184cf4df5ccff7f0e1b489f52066f139e51d3d41ad4e2547d55c8bfcf365

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