Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7d3e6544c770eb…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 11:12:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 68a9bd5a437b131479f3ab81232b7321 SHA-1: 781eed999ef4ba93ae89cdf46313f55a44dc9566 SHA-256: ce7d3e6544c770eb019b6007c772e7d3d8de7a35bcad27daa5cbf789c5e84390
240 Risk Score

Malware Insights

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

This PDF document contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a fake CAPTCHA lure. The document body and embedded URLs suggest a scam related to game hacks or free currency, impersonating brands like PayPal. The primary malicious URL identified is https://netcdn.online/app/431946152/op-rewards-robux-game-hack, which likely serves as a gateway to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/op-rewards-robux-game-hack.
  • 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.online/app/431946152/op-rewards-robux-game-hack In PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/pokemon-go-free-100-iv_GM1094591345.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/pubg-4all-cool-20219-uc_GM1330123889.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_004_off00004f8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8E 24496 bytes
SHA-256: d0fd90d059d58aab07c0895cf1f03bccb6f9ac6adb49fd427b3f6cefba5aae33
font_01_sfnt_off000087bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87BF 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off00009467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9467 18592 bytes
SHA-256: 61fcf6890a53ac437d28a0a1b955c1ae9fc36ec45f89f4a8c20bebee047e4314

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