Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c354219abe1c6c…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 11:49:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d1fc7e933d6ae674d1fa99b669753a51 SHA-1: 49a8396ec89a0d285934faf50091f7ca96ac8124 SHA-256: 18c354219abe1c6c55c3c2a08d182ca20b6cf767cd8f7eb7011246b50385383e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it links to malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The embedded URL http://netcdn.tw/app/431946152/how-to-hack-a-roblox-account-easy-game-hack is identified as a malicious redirector. The document body reinforces this lure by directly including the same URL and related keywords, aiming to trick users into clicking through to potentially malicious sites.

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.tw/app/431946152/how-to-hack-a-roblox-account-easy-game-hack In PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/pubg-uc-ykleme-kod_GM1330123889.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-robux-no-verification-on-laptop_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/hack-tool-for-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/how-to-get-free-robux-aiden_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/wiki-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/pastebincom-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/robux-hack-2021-real-no-human-vertification_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/free-draw-roblox-anime_GM431946152.pdfIn PDF document text
    • http://perpus.ft.undip.ac.id/pustaka/repository/show-me-how-to-get-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
font_00_sfnt_off00002b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B26 22856 bytes
SHA-256: a69daf5cedf91e96b18efed28ecf24151ff54b0c98569edbebf858fec23cae75
font_01_sfnt_off00005e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E69 19244 bytes
SHA-256: 4dcbe17bebf2382ad99832b5327dd7065748ff6dacf6eb853322815bf961736f

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