Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0df88dba699b0d…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 16:19:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5cab8242b053a03367a0517499451db0 SHA-1: 24dc3043a7679e1a21dc0009d28e9a41da5aef2c SHA-256: eb0df88dba699b0d36a62079aff69760e2311daf70760cc666986c98d281e7b2
200 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency or hacks, presenting a fake CAPTCHA to deceive users into interacting with malicious links. The primary malicious URL identified is http://netcdn.tw/app/431946152/dailyrobux-game-hack, which is flagged as a known malicious redirector. The document's structure and content strongly suggest it is designed to exploit user interest in online games to deliver a secondary payload or lead them to a phishing site.

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.
  • 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 http://netcdn.tw/app/431946152/dailyrobux-game-hack In PDF document text
    • http://fia.ub.ac.id/katalog/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/more-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-hack-your-friends-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/roblox-robux-hack-reddit_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/is-there-really-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-coin-master-spins-no-verification_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_off00002ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC8 22208 bytes
SHA-256: 74560a1354e611d24965948063e6a1909e64c15bc213d3ffee627f09ff88a3a3
font_01_sfnt_off00006026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6026 19092 bytes
SHA-256: 319a3b741e60406540a19adb70d742732d8bf817a9bc58f36e4d58ba7e1a6a2d

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