Malicious PDF — malware analysis report

Static analysis result for SHA-256 be31c963627435be…

MALICIOUS

PDF

43.2 KB Created: 2021-06-03 22:16:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3d9a2b3f22eccfee48fb37fc5a486962 SHA-1: d7114cd84ee78bcbb999e42bab2c5205962ade6b SHA-256: be31c963627435be598bd033a9929914a6b40a27cc7e02be1a597e88b6aa3cef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The primary lure URL is https://netcdn.online/app/406889139/coin-coin-master-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack, likely intended to lead users to a malicious site for further exploitation or malware delivery. The ML classifier also flagged this PDF as malicious.

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-coin-master-hack-game-hack In PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/robux-boost_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D15 25608 bytes
SHA-256: 83b4e95ad92a631743d54b2ffea8920ce4725f824ad479dfdb6aaf08188c3b39
font_01_sfnt_off000087dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DC 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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