Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ff71e4135c5a1c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-07 14:53:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 911cf3d3ca1842d630d3de5edc1b75d9 SHA-1: fb190f33412c8a992db3e8ed5cd33449676b4309 SHA-256: 31ff71e4135c5a1ce10e2744cd4b39dd2b3734c9a389e3c73ba060a6a462d298
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded URLs that lure users with promises of game hacks and rewards for popular games like Coin Master and Roblox. The primary URL, http://netcdn.tw/app/406889139/coin-master-reward-link-game-hack, is flagged as a high-risk game hack redirector. This suggests the document's purpose is to drive traffic to potentially malicious sites that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-reward-link-game-hack PDF link annotation
    • http://digilib.stie-yppi.ac.id/repository/roblox-free-hack-injector-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-steal-people-stuff-in-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/buy-all-free-items-roblox-javascript_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/denisdaily-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-home_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/noob-vs-pro-vs-hacker-roblox-blob-simulator_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/dragod-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/bux-life-robux-free_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_off000032a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A3 22352 bytes
SHA-256: 7a5e986cd1cf506fa81e8306be1a540fde5af7e699d9f6e7a64b05e36910db55
font_01_sfnt_off00006446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6446 18340 bytes
SHA-256: c1246ab1d9e393b3d89bf1ae428e5235d00f0bb5ef049749243bc3f4df939c9c

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