Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7a99be3699407f…

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 11:02:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f7e08d7bc0c0c7c89c76898d5ba3027d SHA-1: 408d5fdf897d14bd30a7a62d40bf2a5ae076bbb2 SHA-256: bc7a99be3699407f46c0de4f75ce9c8dd972911c9f4db69132144119fc8a0917
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate malformed streams and redirector links. The document body, though heavily garbled, contains text related to 'free Robux' and a URL matching the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://netcdn.xyz/app/431946152/actual-free-robux-game-hack In PDF document text
    • http://elektrofahrspass.de/images/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-robux-no-human-verification_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_off00004703.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4703 28200 bytes
SHA-256: 6b34d6a6fc62aa7269fac8f04d553a7c26015cfe60aac243fffff76174411f66
font_01_sfnt_off0000879b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879B 18420 bytes
SHA-256: 37b67a04c59087902b42b65f26bec20808041b5185ddbc4d4c9e15973e68d0ef

Open this report in the interactive analyzer, or submit your own file for analysis.