Malicious PDF — malware analysis report

Static analysis result for SHA-256 218d1b7196d90fe6…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 09:26:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 492ff3310d90255bc7f1c4b333167482 SHA-1: 146b2642ad4d479e86c33dc649bf304a9082b431 SHA-256: 218d1b7196d90fe6e057c484734abd8e6a08499e258322cd35c6607da8528121
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) 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 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.tw/app/431946152/free-robux-that-actually-works-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-builders-club-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-lvl-7-script-executor-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-hacked-ad_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
font_00_sfnt_off000030de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DE 22348 bytes
SHA-256: 985d1d6652b3d740aa6398f72e810648a89fd1dbef92e2ab78f83952765fcc7f
font_01_sfnt_off000062b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B8 19608 bytes
SHA-256: d52712f1a35e8680be3c45e78173014feb66661a2560c5e73c6934237b8ae3d4

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