Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4db3b8436070b9…

MALICIOUS

PDF

33.2 KB Created: 2021-06-28 05:02:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bc54ef590389ae74444cc41c7660d7f8 SHA-1: 5aa2ed5c1d2772cc70a5550c923e6aa85ee45247 SHA-256: ce4db3b8436070b922d55ea58fc63f4e1ea20412e0c5bad25caf9599b0a7d402
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is http://netcdn.co/app/431946152/free-roblox-games-on-computer-game-hack. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/free-roblox-games-on-computer-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-robux-hacked-in_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/mc-update_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-vip-roblox-account-that-really-work_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-roblox-jailbreak-hacks_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-marshmello-shirt-free_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/114-hacks_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-mad-paintball-2-hacks_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-speed-hack-using-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-roblox-piano_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/download-coin-master-hack-apk_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
font_00_sfnt_off000029f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29F4 22452 bytes
SHA-256: b836a2ed5bd0824552941557f3ad75a7792b173c64ea20ed6a74195dd1042302
font_01_sfnt_off00005c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C15 19332 bytes
SHA-256: 522b376d0518b549c07150962cf54143fda02766ddea5bb15977e8b80176f55f

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