Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5d21cf3337d8fa…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 09:27:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e85a9868fae0841df9e3389580d5eae7 SHA-1: 9d6227e4eb7bfc17fafe5ecbab7f3c4519a9816c SHA-256: 3e5d21cf3337d8fa84cbfce6e29ab91055f1d47dd8a5859d4f3a5d7b30855c68
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it links to a malicious redirector disguised as a game hack generator. The embedded URL 'http://netcdn.tw/app/431946152/earnrobux-game-hack' is the primary indicator of this malicious redirection. The document body and other URLs reinforce the theme of exploiting user interest in game cheats and free currency to drive clicks to potentially harmful sites.

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/earnrobux-game-hack In PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/alpha-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-no-human-verification-android_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-free-working-gift-card-2021_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-to-hack-somebodys-account-in-roblox-2021-freb-2_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/hackeando-los-ordenadores-en-roblox-derank_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/hack-robux-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-easy-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-respawn-rout-66-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/the-neighbourhood-roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/roblox-dinosaur-simulator-cheat-engine-dna_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-no-points_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/cheats-for-roblox-bee-swarm-simulator_GM431946152.pdfIn PDF document text
    • http://perpus.fisip.unnur.ac.id/repository/comment-devenir-un-hacker-sur-roblox-2021_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_off00002e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E55 22088 bytes
SHA-256: 330aaf17b14d963070c5ed5d268e2fc24fca75d37411c91b17a6e53cd351636b
font_01_sfnt_off00005f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F24 18552 bytes
SHA-256: 6794fc7ee49cdd0a33f98bbbc8a763353555002210e507bd98e2a39f67d6f290

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