Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f51ecd136149c11…

MALICIOUS

PDF

44.5 KB Created: 2021-05-13 18:11:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3cb8de4b0e94e02e0e1e814f9954283d SHA-1: 6b7c56f46ea7b85d6b743976429c4d2a26b0ebd7 SHA-256: 0f51ecd136149c113fa52c4780d6f85e46b30dd02d1d1479606f60630f69cfe2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body and heuristics suggest a lure related to game hacks and free currency, aiming to trick users into clicking these links. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, aligning with T1566.001 for initial access via a malicious attachment.

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/free-spins-and-coins-for-coin-master-game-game-hack In PDF document text
    • http://halle-wasserball.de/images/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/win-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://halle-wasserball.de/images/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-link_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/how-to-hack-roblox-for-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_off000047c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C8 26052 bytes
SHA-256: e177c58c41b4a9d036b3028a9d218c65ae7f01dd60c0c8345a869d3656c88874
font_01_sfnt_off00008168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8168 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00008b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B53 18320 bytes
SHA-256: d1cf6b486e789d6a7a281824944966070be141b92be060b449a52bae7023ebff

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