Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f0d4dfe5b5d919…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 05:52:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 22c3359a79c2cb3bff5cd67784d8aa1e SHA-1: a0ad9fab42c1ffa4c3131e2e45cfcfc3752605c5 SHA-256: 43f0d4dfe5b5d91912ca61ed7b0cb34dcdd25f50f7c32d839a462848d181d8c3
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 0.9865

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/406889139/coin-master-daily-free-spins-link-march-2021-game-hack PDF link annotation
    • http://librarysenior.com/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/hack-coin-master-android_GM406889139.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_off00005177.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5177 25108 bytes
SHA-256: d050d451bbc7a3547a2f260773cbaa91cb5ee56c7c3eb14f0028cb267a6abed7
font_01_sfnt_off00008b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B61 19044 bytes
SHA-256: 3f9aae1fdf8799fca0c9fecd68bec18923aee995b2022bf59fb0518bf5a4831a

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