Malicious PDF — malware analysis report

Static analysis result for SHA-256 3919ff032ee8b59a…

MALICIOUS

PDF

43.4 KB Created: 2021-05-13 09:11:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1162780e7a98f8b281e22583e05e1940 SHA-1: a3fa629dcbd902adeb56646b183795a4f7dd43c6 SHA-256: 3919ff032ee8b59ae36b28e33de537017a63cf3648108cb82f53f393f6f35174
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a fake CAPTCHA and a "free generator" lure to deceive users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts numerous other links to potentially malicious PDF files. The document's content and heuristics strongly suggest a phishing or scamming attempt, likely aimed at distributing further malware or harvesting credentials.

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/roblox-hack-com-game-hack In PDF document text
    • http://www.fabbrotorino.eu/images/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/mcpe-com_GM479516143.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/roblox-pics_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coinmasterfreespins_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
stream_003_off00004820.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4820 27308 bytes
SHA-256: 01e8b8eb3219dac577a9c679581ec50cf456ded4ce8f58c0a6259e81ac6fe7e2
font_01_sfnt_off000086de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DE 18440 bytes
SHA-256: 92e56247950081f5f8ea935637ec6d93dafa31aa334148af106ab9a8365bd2e0

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