Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3a7ef99bfce2c0…

MALICIOUS

PDF

50.7 KB Created: 2021-06-09 17:45:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9426b34e0bd0497a9eaed24614a54ac7 SHA-1: 5ceb8020360940b3330b3d59f5a4275f38123043 SHA-256: 7b3a7ef99bfce2c09f89503b3fde8649099b5c9d5cd327f965ceff27ff1fc595
122 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 fake-CAPTCHA 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 0.9779

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/free-robux-generator-download-2021-game-hack PDF link annotation
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/how-to-change-your-username-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/wall-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/dantdm-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sdn4-wates.sch.id/akasia/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55F1 26332 bytes
SHA-256: 1a848060cbd9d8187e6d5b5fbd6b5848d8f9443572dd62c19243982a83f05d7a
font_01_sfnt_off00009374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9374 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000a01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA01C 19328 bytes
SHA-256: ae8ef929e243e95770ca11aad70b6b8e8876a973adaccc5ec8216cac7fc0c1ab

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