Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aa0ff99c43f79c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 09:38:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1736bee1a7ccd87d9eafd677001a2dac SHA-1: 9d85ced1883bbc41d3f695a510ff26f374f25ff7 SHA-256: a1aa0ff99c43f79c0bc3f770666fca41312353b0273f2ab853631703e3e7449a
168 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and links to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for a 'game hack generator' which likely leads to further malicious content or exploits. The embedded JavaScript and redirector link suggest an attempt to exploit vulnerabilities or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • 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/406889139/coin-master-hack-using-cheat-engine-game-hack In PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/mcpe-download_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/ex-7-roblox-hack_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/dungeon-quest-roblox-item-hack_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/why-does-roblox-shut-down-when-i-use-cheat-engine_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-roblox-exploits-2021_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/hacking-command-game-roblox_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-injector-for-roblox-v3rm_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/how-to-give-robux-for-free_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://leads-bd.org/app/webroot/js/ckfinder/userfiles/files/free-robux-generator_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_off00003132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3132 22724 bytes
SHA-256: 21d1c21a0f3863d1a7bc6584be79c9f8c69c933738a5e220eb12d26f93e52f9c
font_01_sfnt_off00006447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6447 18356 bytes
SHA-256: 8e765daddc81592b9c307bdaeda3e5bbf01844ff84e3365a98fbfe07b378b21c

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