Malicious PDF — malware analysis report

Static analysis result for SHA-256 deadd21bca9025f2…

MALICIOUS

PDF

226.8 KB Created: 2021-07-06 08:45:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 88cda627b5a7905f61adef25aa6e619a SHA-1: 5bcc638b5428eb43b46a000e2db745b5dd45f47e SHA-256: deadd21bca9025f2adfd37e66407eb3312d6d19eda93b222fe28074822cf470f
250 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and social engineering lures, specifically a fake CAPTCHA and a game hack generator. The embedded URL, http://netcdn.tw/app/1094591345/can-pokemon-go-free-pokeballs-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the lure and the malicious URL, suggesting an attempt to trick users into executing further malicious content.

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/can-pokemon-go-free-pokeballs-game-hack In PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-santa-christmas-obby-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-without-verify-2021-april_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/face-png-roblox-free-face_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-shards-shard-seekers-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/download-free-mods-for-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-how-to-hack-into-accounts_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/troll-avatar-roblox-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-peoples-accounts-on-roblox-rc7-script_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/c-code-for-roblox-level-2-hacks_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off00031fcd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31FCD 25576 bytes
SHA-256: 9dc27929dcd188e8aede438897a02b011cffc67f247b2f7e7ea068f2928ac65b
font_01_sfnt_off00035bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35BCA 18592 bytes
SHA-256: d489a42d5a6352582801825c6d2df784c221bc01ba84dd8ff45094a45f773d15

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