Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d75973b509e624f…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 15:30:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a97bf060a4b7ab56401e894a02a522d SHA-1: 635d22da982bccd045ecd4954bbe09cb2c7e6535 SHA-256: 8d75973b509e624f5aae7f44cd8b8c0446330098a14b9bc9ea69c05b82eb8a70
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. These links redirect to external websites that promise game hacks or generators, a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple redirector links further supports its malicious nature.

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/431946152/2021-roblox-game-hack In PDF document text
    • http://mohacad.hu/images/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-demon_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-hack-codes_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_off0000474e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x474E 24712 bytes
SHA-256: a45dbebc5fab3015a6a76dacabbed95920ccf1a48c145b41844800500879f740
font_01_sfnt_off0000806d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806D 18184 bytes
SHA-256: 056fc97d28377ebe533b38410a286871364a28d37687da14045fa683fef2556f

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