Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ef69d5b462d27f…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 11:08:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: be91f9783df8a9d6dddedb93b17e87bd SHA-1: 44b7bb787c01a2982311852d2b32bacd06e780dd SHA-256: b8ef69d5b462d27f303758383716875d299184e11a2b2b51b044afcd183c3ef5
200 Risk Score

Malware Insights

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

This PDF document contains multiple invisible links and CAPTCHA-themed lures designed to trick users into visiting malicious websites. The primary redirector URL, http://netcdn.tw/app/431946152/robloxhacks-game-hack, is associated with malicious redirector infrastructure. The document body and embedded links suggest a lure for game hacks and virtual currency, a common tactic for phishing and scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.tw/app/431946152/robloxhacks-game-hack In PDF document text
    • http://library.acehresearch.org/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-my-money-safe-s_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hacker-tucoon_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-with-recapcha_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/comandos-para-hackear-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/every-free-roblox-item_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://library.acehresearch.org/repository/best-ways-to-make-robux-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/boombox-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-spin_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/i-want-free-robux_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
font_00_sfnt_off00003075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3075 21836 bytes
SHA-256: 29d58544f1bfcb93ce52b4793c2697fbe6b6ad4cd7b9cfd5e0710b81b20b6bb1
font_01_sfnt_off000060b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B1 18820 bytes
SHA-256: 2ccea82525463c59d3ef013baba30ec334edef503592fdffe768c3dcf14999d8

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