Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c629e1be26bd8d9…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 20:20:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a1133e2760af2232a4c0bb1874c5a9bb SHA-1: 9de73c0ef21ed7e39ce135944d9128065657877e SHA-256: 3c629e1be26bd8d90ce5446af0364140791e556a8ab052eb5bee4ba6777facc1
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 URL identified is https://netcdn.online/app/431946152/how-do-u-get-free-robux-2021-game-hack. This behavior is consistent with phishing or scam campaigns designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded links and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/how-do-u-get-free-robux-2021-game-hack In PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/earn-free-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
stream_004_off00005106.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5106 27080 bytes
SHA-256: 80da02fdfd473189c115ed034c7e328b5675c5eb64a83591e0af1b12e4204c73
font_01_sfnt_off00008cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDD 19040 bytes
SHA-256: 14ed63897d8c38c9b74f4ae6c685ddc963b8153977262fdb6411d06658c720a7

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