Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e7dbd36f76a922…

MALICIOUS

PDF

35.5 KB Created: 2021-07-07 19:26:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d285d5c5536313a6c8d4389deb17c18a SHA-1: 87e5379f7547a71b2ceb30d864dde43b071731d0 SHA-256: f0e7dbd36f76a922c541636109c378f3c2cc8facdce7811ab2a9ad0536a033a1
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/daily-free-spin-link-for-coin-master-game-hack. This URL is presented as a lure for game hacks or generators, indicating a social engineering tactic to trick users into visiting potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/daily-free-spin-link-for-coin-master-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/cheat-roblox-windows-store_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-make-a-roblox-hack-your-own_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-usernames-and-passwords-roblox_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-cheat-engine-66-bypass_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-cheat-in-roblox-ro-ghoul_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/hacking-brothers-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-highschool-2-hack-script-pastebin-money_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_002_off000032a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A1 23096 bytes
SHA-256: 50595df20a5f22a486d87c162c83013ac0af616e195c3da0d722039d6fa6c0c3
font_01_sfnt_off000066c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C7 18768 bytes
SHA-256: 84e60b0c833095dcfc8bdf529583e07b6d46dae7c19f787dcb3f544e86957181

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