Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cfd8a526b6eb5f…

MALICIOUS

PDF

48.2 KB Created: 2021-06-04 04:50:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7836db83e14ff26941ebfbfe7bef480b SHA-1: 3ca27d679766f93b036bc68b4eeeb24c7a571d5f SHA-256: b4cfd8a526b6eb5f889dfc286c534d59ef4a6c5fe781c0af7264b2a486f7005c
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 0.9796

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/oprewards-com-robux-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005121.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5121 25956 bytes
SHA-256: 6a2d502a8b792b716ee05c0998a24530346cf0891b844bfa7e82ba5b45df6506
font_01_sfnt_off00008da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA9 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9794 18852 bytes
SHA-256: cf2c3b83afe77c4831f4d7babd4a60d9ba9b4343e1e798506478eab5d5eea77b

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