Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f13697b163a6df…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 03:47:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f6fcf59b6948c58a6960afd179952db3 SHA-1: 9fac57712a44375cc2c2c40bc09ab56ef29b397d SHA-256: 31f13697b163a6dfb41e5ef374a368508d331c50b91530ce5b7ab3cf23539afb
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector, disguised as a "coin master hack" lure. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead the user to potentially harmful content or further stages of an attack. No scripts were extracted, but the document's structure and embedded links strongly suggest it's a phishing or social engineering attempt.

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/406889139/coin-master-hack-apk-ios-game-hack In PDF document text
    • http://digilib.unla.ac.id/repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-trading-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-hack-roblox-and-get-free-stuff_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off00003258.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3258 23056 bytes
SHA-256: 4f6974c296339a1eada0bebd18f6b8a79b4140d4b3a1e7bc9fad3942c199cc8a
font_01_sfnt_off00006666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6666 18180 bytes
SHA-256: 669191ced257cad8cf719fd096a029eb32cc90bb1eacba4ce7ed61202962bed4

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