Malicious PDF — malware analysis report

Static analysis result for SHA-256 40455f4be22944ba…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 11:22:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb74725e31bb751f2dd7b8f4eb65254f SHA-1: 11770aa30958a1bcd84f5771d13077a05df53698 SHA-256: 40455f4be22944ba264a5f8b86e75df0ae4c90f6f8656715d37bbb7c1da6ac5e
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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-1-million-robux-for-free-2021-game-hack PDF link annotation
    • http://library.yamasi.ac.id/repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/ww-roblox-come_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-get-com_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-codes-june-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-commands_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-mad-murderer-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-shirts-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hackenrobloxdenn_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-cookie-list_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_off0000325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x325F 21816 bytes
SHA-256: f015a9ab769ae009cbd51e52539139c95c57b286189fc3b03960ba48b35e9c45
font_01_sfnt_off0000626b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626B 19776 bytes
SHA-256: 3729c149e68d86db1c65f615c1f40252ecd2b73d2d971cd5d72cafcdeb2ff644

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