Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f12e59bfc38c16…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 18:41:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d3fcf38732f6021ec826cb15607acb51 SHA-1: 9a79914a125ed58291b6626ec54181ff31f16858 SHA-256: 89f12e59bfc38c16cff059c3792240650d18834ee33271fc32ab32c17ba1caef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The document body and heuristics confirm the intent is to trick users into clicking these links, likely for further malicious content delivery or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/claim-free-spins-coin-master-game-hack In PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/roblox-hacker-shirt-template_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-no-sign-in_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/roblox-hacking-packs-for-accounts_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/roblox-speed-hacks-that-u-can-type-in-chat_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-free-robux-2021-no-hack_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-ninja_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/veil-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/roblox-avatar-free-superhero-body_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-actually-hacks-on-roblox-not-a-model_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/charlie4-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-o-get-free-robux-new_GM431946152.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-roblox-gift-cards-unused_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_off000031b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B1 23088 bytes
SHA-256: 611a7523eddb2541f61d29d895b0fda03dca1d46c6cd05fbd0387daf6abb959c
font_01_sfnt_off000065c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C7 18508 bytes
SHA-256: 66edbbd631945b07c06d9fd06a14c74e41c138e401aa3f28fe2d50c5e2faa941

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