Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f44f8ab950488d1…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 10:01:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5259f7bfa7860556eb2e8d3bbfefea9b SHA-1: 1f33b041129b3935803282cecbac1c738f15cf63 SHA-256: 8f44f8ab950488d1664e09158da686e00e1b579092a26d6d143ead116d6ef324
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and lures users with fake CAPTCHA prompts to trick them into clicking. The primary URL observed is https://netcdn.xyz/app/431946152/free-robux-generator-no-human-verification-2021-game-hack, which is associated with a 'free generator' scam. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest an attempt to redirect the user to a malicious website, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/free-robux-generator-no-human-verification-2021-game-hack In PDF document text
    • http://pechativmoskve.ru/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pechativmoskve.ru/images/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://pechativmoskve.ru/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://pechativmoskve.ru/images/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pechativmoskve.ru/images/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pechativmoskve.ru/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://pechativmoskve.ru/images/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://pechativmoskve.ru/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://pechativmoskve.ru/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://pechativmoskve.ru/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://pechativmoskve.ru/images/coin-master-free-spins-april-2021_GM406889139.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
font_00_sfnt_off00004b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B92 25284 bytes
SHA-256: 662c075d05db425dcfd588b0f65c4c0f2f7bb00f3bc61a925ee7742a71f51165
font_01_sfnt_off000083d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D3 19260 bytes
SHA-256: cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4

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