Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad73c8e63761ccc5…

MALICIOUS

PDF

35.0 KB Created: 2021-06-28 10:03:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b3f74c612c9ba1c8ffe95d7b7e2433c2 SHA-1: 6b0e867cd1a1dda0682e68541ccd08d85928ba16 SHA-256: ad73c8e63761ccc593ab12c37b371de19669a50720400177198abaef867590d4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector service, which is a common lure for distributing malware or phishing content. The document body explicitly mentions 'hack Roblox Android Lucky Patcher 2021' and includes a primary malicious URL, indicating a social engineering attempt to trick users into visiting potentially harmful sites. The presence of embedded URLs and the ML classifier firing strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/hack-roblox-android-lucky-patcher-2021-game-hack In PDF document text
    • https://dolphintour.vn/images/uploadsfiles/smurf-backpack-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-spins_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/hacks-for-free-robux-on-roblox-no-human-vertify_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-hack-robux-on-roblox-2021-mac_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D1 21716 bytes
SHA-256: ad4a89e24d55734c2f443580e936e0486c6c445f8f45db89ecf515826e9e80ce
font_01_sfnt_off00006078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6078 20096 bytes
SHA-256: 7623b5ac048c4d128694dbd2e41dddcb58ae85be8f97232380e4e860d6822919

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