Malicious PDF — malware analysis report

Static analysis result for SHA-256 0826034339fb41ec…

MALICIOUS

PDF

43.5 KB Created: 2021-06-10 17:59:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e8090f34e59c3ef6d2b6852e309896a0 SHA-1: 97ca75343e8ca559bd00a48f251785dc5d53a9ae SHA-256: 0826034339fb41ec2c27c21c576d933e330330894789d65d2511646a0a409971
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting "free robux" or "game hacks". The primary malicious URL identified is https://netcdn.tw/app/431946152/easyrobux-today-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering lure designed to redirect users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/easyrobux-today-free-robux-game-hack In PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/the-crew-cheats-at-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-exucutor-free-download-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-often-pubg-uc-paid_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/easy-robux_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
font_00_sfnt_off00004f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F86 23956 bytes
SHA-256: 446a0ea6fad3f6b22dc5353745780ebd9ba05eb4513664aa1d153365ddc02be6
font_01_sfnt_off00008614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8614 18596 bytes
SHA-256: 717ab0a8b9389f7dd439d75db5ee992067f63ef1bd72d366e76364e3a5af0aa6

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