Malicious PDF — malware analysis report

Static analysis result for SHA-256 3138b3e719bfa3ba…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 09:27:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cf3035a379fcdd43aed7daca7526914b SHA-1: 5dbd4e7d71f70925279b9d8c7223601f840dfd46 SHA-256: 3138b3e719bfa3ba32323b20952d201b6f41f148756e9f26c5625c11a9bd183d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to pages offering game hacks and generators, a common lure for phishing or malware distribution. The heuristic firings confirm the use of a game hack redirect lure and flag the PDF as malicious. While no scripts were extracted, the presence of numerous malicious links suggests the document is intended to lead the user to a malicious download or exploit site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/cute-free-hair-on-roblox-game-hack PDF link annotation
    • http://perpus.stfm.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/rewardex-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/pokemon-go-free-avatar-items_GM1094591345.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/easy-way-to-get-free-robux_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
stream_004_off00005240.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5240 24944 bytes
SHA-256: 3da79c8b3b3bd51e9963c28b16e7b1abdf674197044dafd6ea9d85711b512e5d
font_01_sfnt_off00008bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCA 18540 bytes
SHA-256: 488c37b81cb6318595a8d643f53454b31d34364b68f61b3c1daecc568804ddf5

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