Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f54caaf109f5cc…

MALICIOUS

PDF

45.1 KB Created: 2021-05-13 10:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3196ea8e685d40e660307d92ba5ed1db SHA-1: 890c4bf92a32d546e3070f865b36e33b4d817218 SHA-256: a0f54caaf109f5cc585fa4768979dcf6077b301446574cd51ff56ad9ffa6ffce
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure and 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 0.9621

Heuristics 6

  • 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.
  • 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.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-hack PDF link annotation
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/rbx-free_GM431946152.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning.man2banjar.com/__statics/gudangsoal/files/www-bandicam-com-free-robux_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_003_off00004a52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A52 25288 bytes
SHA-256: 0f9427daceb071a873a8b80b5c70e815efa15065ed97faac3068714ed2ff811f
font_01_sfnt_off000084b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B2 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E55 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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