Malicious PDF — malware analysis report

Static analysis result for SHA-256 334b10d728c583af…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 11:24:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6af34151036c3298d3f9f0d90b52af86 SHA-1: 6b10259e3a66e2542d00f760ff3c86c9fb5b305d SHA-256: 334b10d728c583afb7ee3dc6ecd35b4009f96b1d0698034aff76bf54260b90b2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'hacks' for popular games. These links likely lead to malicious sites designed to exploit users or deliver further malware. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/406889139/coin-master-unlimited-spin-link-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-roblox-passwords-on-mobile_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/cant-make-my-items-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-how-to-get-groups-for-free-and-make-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/pokemon-go-free-joystick-mod-ios_GM1094591345.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/be-thomas-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-in-roblox-sub_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-hack-without-email_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
stream_002_off0000306c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x306C 23576 bytes
SHA-256: 09c7aaf92f590b045d030227d563c610ae221e9987b28f527536cafad1251602
font_01_sfnt_off00006603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6603 18876 bytes
SHA-256: 9d60d37e067a6d4c442ff84830afebfbfe0c10ff7bd2d1a6bfdb0c0aec4c2d8b

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