Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fff329d102bdf5…

MALICIOUS

PDF

44.2 KB Created: 2021-06-04 03:50:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 810e6aa92cbd0c9b709a7f1065263da4 SHA-1: 7983c31b6e2d6b562f99fde9ea94f8190ff3bc1d SHA-256: a0fff329d102bdf53a63bb6355213cfd56ba7ff4ddd25a6507d033482f817466
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a malicious URL. The document body, though heavily obfuscated, contains references to 'Coin Master Free Coins And Spins Today' and a URL that aligns with the heuristic. The presence of embedded URLs and the nature of the lure suggest an attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-free-coins-and-spins-today-game-hack In PDF document text
    • http://pustaka1.unindra.id/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-com_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka1.unindra.id/repository/wurst-commands_GM479516143.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_004_off0000513b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x513B 24964 bytes
SHA-256: fb030addf8b2e11d9c1211fb3db31dc2a7542e24f8229d4ee9766dd632efafd4
font_01_sfnt_off00008a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4B 18240 bytes
SHA-256: 4e9460ee7c922f2330eb91d2df2ab210a384988491c8b06196f83513902e5b38

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