Malicious PDF — malware analysis report

Static analysis result for SHA-256 899ae778f13d9d53…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 23:28:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6ccfb7d55822eed240e926070b0402a4 SHA-1: f39d313f0e889969bb17e917d5acec517aefd913 SHA-256: 899ae778f13d9d533e92f10c08f05620750349092e3f195220cccec774806166
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector URL that promises "game hacks" and "free spins," a common lure for malicious content. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure strongly suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/daily-coin-master-free-spin-apk-game-hack In PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-tiktok-free-likes_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id//repository/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-girl_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-coins-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F4 25388 bytes
SHA-256: 29fa1c46532c77dd4abd9850c8335aa880201cb7f86e7bc3673fb2c629d0c23c
font_01_sfnt_off000089e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E9 18476 bytes
SHA-256: f742b896080f556428e397b41111c37328508f14d40aa043f47df4a758656a88
font_02_sfnt_off0000ac79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC79 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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