Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16d7078e8cf287f…

MALICIOUS

PDF

42.1 KB Created: 2021-05-14 14:38:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2a5963b351630a7235f591dab5ad5a8d SHA-1: adb87e4fae454b7d8f31c7205684874e00e2e21d SHA-256: a16d7078e8cf287f51036038e4be7b420e64f33fd069292329d152cde7dd73ae
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and lures related to game hacks to deceive users into clicking malicious links. The primary malicious link identified is https://netcdn.xyz/app/431946152/flame-gg-free-robux-game-hack, which is part of a known malicious redirector infrastructure. The document's structure and embedded links suggest an attempt to exploit user interest in free game currency or cheats to redirect them to potentially harmful sites, likely for further exploitation or malware delivery.

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/flame-gg-free-robux-game-hack In PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/roblox-arsenal-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_off00004627.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4627 25328 bytes
SHA-256: 095226acfd1c515c2a906576b7c5eceffc550f8b45ce8a527a55f4c412ba5d81
font_01_sfnt_off00008043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8043 18864 bytes
SHA-256: a12d67d537c0c2cb89f37f7f05ea7de5b6c0986bd532439e1b20da8093887b01

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