Malicious PDF — malware analysis report

Static analysis result for SHA-256 d919d69c5ae95fd8…

MALICIOUS

PDF

43.9 KB Created: 2021-05-16 06:33:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cf407b01f9fc6f7166ca320209164f82 SHA-1: 6cc5adae2a9606789b540637e678a997f4d639e7 SHA-256: d919d69c5ae95fd8993515534689d82bfb2620192c4e422dae30b98f35ef700c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-roblox-injector-game-hack. The document body, though partially garbled, also contains references to these lures and the authoring application 'wkhtmltopdf', suggesting it was generated programmatically to host these links. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/free-roblox-injector-game-hack In PDF document text
    • https://www.tsdb.com.au/images/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.tsdb.com.au/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.tsdb.com.au/images/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://www.tsdb.com.au/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.tsdb.com.au/images/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.tsdb.com.au/images/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://www.tsdb.com.au/images/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.tsdb.com.au/images/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.tsdb.com.au/images/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B74 26924 bytes
SHA-256: 874c93b213f1b6cc6f293dec4c544299def5d3a85969c38324f309632cdcf0f0
font_01_sfnt_off0000894a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x894A 18240 bytes
SHA-256: 982f5c9c7a17738cdf254efb30c47e94aaf5f1193221314be64a44066d2d2c00

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