Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bb4f9e3fa3d2c4…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 10:01:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27de09bc10e1a6a538fc3eba295917d4 SHA-1: ab40a1a9740a0fa15784e40dcbee178f4326fbf0 SHA-256: 55bb4f9e3fa3d2c4b3f7b9c58a856e4e8d656b5651befaecdb7f1fe4a99302d0
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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-daily-spin-free-game-hack PDF link annotation
    • https://digilib.darmajaya.ac.id/repository/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/freer-tiktok_GM835599320.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/can-you-get-in-trouble-hacking-an-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.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_off000033c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C7 22608 bytes
SHA-256: 73dd1e3265d0cad9f70634bae62632c8a606038229e2697634b147a89ae474d3
font_01_sfnt_off00006616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 18596 bytes
SHA-256: 4bd887bddad3707660fa4e91161c1a16423faf42318738ff8904c415139aa447

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