Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb389d7541af978…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 14:46:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1bc5d840b9a2ceaf23fd9c2eed6b4dff SHA-1: a761db749fb24a50fa39f692bb734b8011525235 SHA-256: 6bb389d7541af97819986436260c3b84dc73b91661a50bf5e155d88f2cb890e5
200 Risk Score

Malware Insights

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

This PDF document employs a lure of free game resources and presents a fake CAPTCHA to trick users into clicking malicious links. The primary link, https://netcdn.online/app/406889139/free-coin-master-spins-2021-link-game-hack, leads to a known malicious redirector. The document's structure and embedded links suggest an attempt to exploit user interest in online games for malicious purposes, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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
  • 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/406889139/free-coin-master-spins-2021-link-game-hack In PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.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_004_off00004f00.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F00 25056 bytes
SHA-256: 9aa5031844cfcdc0cfafbafa3035e5a39762857f997866abef42304927a58a8a
font_01_sfnt_off000087f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F2 18456 bytes
SHA-256: 5afa98feccd95d8eb179cf82941ba5e9245b2aa88804d11c8626ac43caff3152

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