Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4cfa39b7796457…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 06:02:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 389395b7c2c36203e8047205949158ed SHA-1: 1f6d8987a858332d9ca58e4d7ce5e9e39ac2d3cf SHA-256: 4c4cfa39b7796457fb4b9b0936107c57ae4c3319a43f4073cf0f1a418e536d06
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/old-roblox-accounts-for-free-game-hack PDF link annotation
    • http://library.umuslim.ac.id//repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/tiktok-free-likes-and-followers-apk-download_GM835599320.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-assassin_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-app-for-free-spins_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
font_00_sfnt_off000052be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52BE 24312 bytes
SHA-256: ed55773a46dbb7e819e81217d0d3eea96b94fe13ef148d7a16dc342ad35ea02b
font_01_sfnt_off00008910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8910 18368 bytes
SHA-256: f0ce6b820c45e6e2988b5e2b6f1fd71f334d25f96e0178b7a1255a1417217111