Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0bc58240ab7d75…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 08:38:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 496123df95bce2c970ef9a78f0d8c8fe SHA-1: 385f52a36fefda8162ff6129e17de25da37b6040 SHA-256: 0a0bc58240ab7d750f107bcf37e973b64df817a52674b3ad33a3f618e7e139da
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to 'free Robux' and 'game hacks' to entice users to click on embedded links. The primary link, http://netcdn.tw/app/431946152/how-to-get-free-robux-on-phone-2021-game-hack, is identified as a malicious redirector. While no scripts were extracted, the document's structure and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content or further malicious downloads.

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-free-robux-on-phone-2021-game-hack In PDF document text
    • http://bepquannhu.vn/upload/editor/files/r-roblox-free_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/hacks-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/static-moonactive_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-girl-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/tiktok-free-games_GM835599320.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-cheat-robux-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-hack-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-online-hack-no-human-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_off00002fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEE 22704 bytes
SHA-256: 689747d75abba14998f7c2b0e8cda4171bc8fb871ecb1d622d3658818386e96a
font_01_sfnt_off000062be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 19704 bytes
SHA-256: 265cd9cc4e01e5bd54911c1682e25479b9899573a838b8ddb67dea599715535e

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