Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec56ecbcd04caa8…

MALICIOUS

PDF

42.3 KB Created: 2021-05-13 12:35:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0a91b8ea5b14cdb95788e8f2a7a8e398 SHA-1: 475f3047a1fb310a6a7461d02d0002f0660a12b8 SHA-256: 6ec56ecbcd04caa890aa59bd7c8287eda30b26bafbc92b712aabbdcf573bc4ed
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a fake CAPTCHA lure to deceive users into clicking on malicious links, specifically promoting 'game hacks' and 'generators'. The primary malicious link identified is https://netcdn.xyz/app/431946152/give-me-robux-now-game-hack, which is part of a known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction for redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/give-me-robux-now-game-hack In PDF document text
    • http://texnes-plus.gr/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://texnes-plus.gr/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://texnes-plus.gr/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://texnes-plus.gr/images/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://texnes-plus.gr/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://texnes-plus.gr/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://texnes-plus.gr/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://texnes-plus.gr/images/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://texnes-plus.gr/images/roblox-robux-hack_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_off000048df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DF 25240 bytes
SHA-256: 6aef76ff8fcb5b1ef03183fe9f276fc0c8deed4ec593bc4c26524cdfecfce979
font_01_sfnt_off00008233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8233 18444 bytes
SHA-256: da387504e4ee90144f6399ec13e2f6eb5be90933d390e8f78ca10c807e4b036a

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