Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6efc45026e50c1…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 16:31:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b0c1cb9831504d65a4ed3f2d58eea317 SHA-1: 55a239aef00dea825fd20a3f7bfc2a0861b1d7af SHA-256: 8a6efc45026e50c140fcca142cfa238607f6e23702e10d2cec3ae09af99e43d0
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary lure URL is http://netcdn.tw/app/431946152/how-to-get-100-robux-for-free-game-hack, which is flagged as a malicious redirector. The document body reinforces this lure with phrases like 'How To Get 100 Robux For Free' and 'CLICK HERE TO ACCESS ROBUX GENERATOR'.

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.tw/app/431946152/how-to-get-100-robux-for-free-game-hack In PDF document text
    • https://tena-g.hr/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/inject-hack-com-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/vortexx-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/juegos-para-hackear-en-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-games-that-actually-work-robu_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/mobihack-net-roblox-hack_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_off000030ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30EA 21980 bytes
SHA-256: 1b45bbcee3a4b7e85d539fd534c7183e8a596ceb2cde6d5c64c4edf4a8496797
font_01_sfnt_off00006162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6162 19264 bytes
SHA-256: ddcaa731095bd34e6951b50a1ad93647ccdf135a8260edd799a5aaff4024c1d7

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