Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8a0137c70f120b…

MALICIOUS

PDF

227.5 KB Created: 2021-07-05 23:40:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e4e97f13241b7076a78be2835ffe8cc1 SHA-1: d2f8a175b0d4a2986d2563b3185820bfa80fdff8 SHA-256: 6e8a0137c70f120b5263ba9112305a1409bf62895974c94f2707fe79f550f8ec
250 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including a fake CAPTCHA lure and a link to known malicious redirector infrastructure. The embedded URL, http://netcdn.tw/app/1094591345/is-pokemon-go-free-on-iphone-game-hack, is associated with game hacks and redirects users, likely to a site that attempts to trick them into downloading further malware or revealing sensitive information. The document body, though heavily obfuscated, contains references to the lure and the redirector URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • 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.
  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/1094591345/is-pokemon-go-free-on-iphone-game-hack In PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/hack-roblox-secret_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/robux-redeem_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/all-robux-promocodes-no-hacking_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-november-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/free-gray-pants-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/roblox-followers-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/what-is-wurst_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2bandarlampung.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-march-2021_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
stream_023_off00032274.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32274 25576 bytes
SHA-256: 459ea2566970ce926a5f14a0a6e7a2e70d74395ecb29f5594af648e39fc3f539
font_01_sfnt_off00035e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35E7D 18700 bytes
SHA-256: eedeebf04efc9b61c40ab4c5b719196b60fb7913c640f184d2e5d47c112a567d

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