Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e38f90b514aea2…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 14:35:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e3b37e421cfe6b2d26680a19e45e63d8 SHA-1: c16ca01a101b2591e29e8245ec09b518d7516d00 SHA-256: 64e38f90b514aea2ac6f464c0ee381f3774b5c512345d1eb21d87b6795bfa2b2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic indicating it links to a malicious redirector, specifically advertising a 'free generator / game hack'. The document body and extracted URLs reinforce this, pointing to a lure for free game currency. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the primary attack pattern involves social engineering via a malicious link.

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/freerubux-game-hack In PDF document text
    • http://library.umla.ac.id//repository/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-do-i-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-card-codes-no-survey_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_off00003122.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3122 23160 bytes
SHA-256: 0dee5e1b96e31156c8a02c7be5a0d2f9dc904e2c9a319f0c4ab97deaa7af5fd6
font_01_sfnt_off00006595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6595 18572 bytes
SHA-256: a4910544a3301e21d5425f47d387c0dcd2b1454e32e0c532c02705c370365377

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