Malicious PDF — malware analysis report

Static analysis result for SHA-256 23af4bb48c138855…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 11:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: bcaa4b5f6a6260e98e6c62cf71942ece SHA-1: 70b2cdee1dae5dcefda4bf4c20cb92afcf43c3a2 SHA-256: 23af4bb48c138855faa10018d8dbcf950f68f5d141f27196632fb802c5154f1b
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/431946152/robux-free-co-game-hack PDF link annotation
    • http://digilib.stimlog.ac.id/repository/leafy-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-wearedevs_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-things-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/features-roblox-robux-hack-apk_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-accounts-website_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robuxs-by-bananaman329_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-candy-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-synapse-cheat-script_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/gods-of-elements-roblox-hack_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_002_off00002c9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C9A 22772 bytes
SHA-256: c2910a859335bba1eb1761b16fe0983130956d40f99c9691bbdc8d7daeee8683
font_01_sfnt_off00005fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD8 18716 bytes
SHA-256: 776cb4e5338264d595c967a8fec9379201c9a4b17293b3c44edd5cf6cd499e31

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