Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cdb4d3f7f11b25…

MALICIOUS

PDF

35.2 KB Created: 2021-06-27 20:40:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2a98f545e5705eec834096f110aba777 SHA-1: 91b839e14b417b3d2f8a8b7143dc23a6b4958559 SHA-256: 42cdb4d3f7f11b25deb40fd7e1be9aa21e3b9fb0a0b4158caf7a18bdf582936b
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.co/app/431946152/free-account-roblox-generator-download-game-hack PDF link annotation
    • http://digilib.iailm.ac.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/pubg-uc-deducted_GM1330123889.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-roblox-cards-not-used_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-themepark-tycoon-hacked_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/robux-hacks-2021-number_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-hack-roblox-plaza_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/cool-clothes-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/royalty-free-roblox-background-forest_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/facebook-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-free-robux-on-phone-android_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-minecraft-hacks_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_off000031f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F8 22236 bytes
SHA-256: b5edbab0df0fb9aa178908f20fcd295938275d9655eccc770ef043d6e6e0ed5b
font_01_sfnt_off00006388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6388 19400 bytes
SHA-256: 872e9ac477dbf5d68ca36fe6bf6e62c21fa727247409484d60bd8c25ff9b8472

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