Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dad66a48b09a36…

MALICIOUS

PDF

45.0 KB Created: 2021-05-19 08:48:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8f3f6bc58b9629eb67b7ff7d38b08060 SHA-1: 0a27abff29543b64996a2ee77e8360182481ed36 SHA-256: d8dad66a48b09a363f3f28dfb99606283aeb093a1ad3ed7b64ddc4461efceee8
240 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a game hack generator, which is also presented with a fake CAPTCHA lure to trick the user into clicking. The document body and embedded URLs suggest a lure for free game items or hacks, likely leading to a malicious website. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 6

  • 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
  • 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 https://netcdn.xyz/app/1094591345/without-pokemon-go-free-coins-game-hack In PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/wurst-115_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/roblox-download_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://www.yaringhospital.go.th/UserFiles/File/minecraft-xbox-360-free_GM479516143.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_off000048a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A6 24356 bytes
SHA-256: ce923a8116f70f058f80f9e58c40b0989086e3ce0663d40851bec3c2f2db5ee3
font_01_sfnt_off0000803e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803E 3636 bytes
SHA-256: 99dd96e89babb04aea0f0ebf99e33ebde901eaa524a16077e4ca0928c8dd6ae0
font_02_sfnt_off00008d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D09 18568 bytes
SHA-256: 2a6a9f7b918ba5cff68282ee1a417506bc48f87a5c741850e6ac66799bc5f3ae

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