Malicious PDF — malware analysis report

Static analysis result for SHA-256 b677f9e20e4e554c…

MALICIOUS

PDF

35.6 KB Created: 2021-06-27 03:46:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 59eaa3b45f1e8b71dd9f8fb6c9f6ef58 SHA-1: 205ba322e57449571fa9f10816af0142e164e104 SHA-256: b677f9e20e4e554c462b51ff49a86efdb7c79641f431ace4a43596c612fee2a5
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/get-free-clothes-on-roblox-2021-game-hack PDF link annotation
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-claim-gg_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-hack-exploit_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/earn-free-robux-rbxblaster_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb//repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-cool-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-lumber-tycoon-2-xbox-one-cheats_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/como-hackear-una-a-gente-en-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-glitch-xbox-one-2021_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/pastbin-robux-hacks-for-free_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-bc-hack_GM431946152.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://library.feb.unila.ac.id/rfeb/repository/robux-gratis_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_off00003316.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3316 22472 bytes
SHA-256: e89b23fa876ca1386419e731f966154d9be2079236b7695ef738964e8388b87f
font_01_sfnt_off00006546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6546 19320 bytes
SHA-256: 9799064f656b5664766d0f146353efdaf0199c68ac301258af148f2a9f56dc60

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