Malicious PDF — malware analysis report

Static analysis result for SHA-256 151ad84232a28774…

MALICIOUS

PDF

44.4 KB Created: 2021-05-13 13:05:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b9fe6657df1deb492e664bc199906b59 SHA-1: 3266bc5998f210e0f849fcea1467b23057d61f3e SHA-256: 151ad84232a28774b92540b624a460622a1db7db750ff19746a674f92ca7bfdc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as 'free generators' or 'hacks' for popular games. The document body and embedded URLs strongly suggest a social engineering lure to drive traffic to potentially malicious sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-free-spin-coin-master-game-hack In PDF document text
    • http://kfz-werkstatt-etp.de/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/roblox-points_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/get-more-robux_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000494d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494D 24912 bytes
SHA-256: 71519d29ee6564870b0b75127b0e04c0f0066f58d732c0c62eab659fb8df4565
font_01_sfnt_off00008209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8209 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBA 18056 bytes
SHA-256: 6e419222a3f00e097ec5a4796a0d55da2a670d2aa1bcbb1aaa1cf298b26301b5

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