Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89513b3abbed837…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 10:41:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2337429c8cda94aa4d1c51a16bac0ca7 SHA-1: 67ab2919c81acbc248f22eec11311a772d157585 SHA-256: c89513b3abbed837863d44ff9119d2dbe8bcd10e71fdc7c7c8d8fa17638f288e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-confidence heuristic indicating it links to a 'free generator / game hack' redirector. The document body and embedded URLs reinforce this lure, specifically mentioning 'Robux' and 'game hack'. While no scripts were extracted, the primary attack vector appears to be social engineering via a malicious link, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/what-is-a-robux-game-hack PDF link annotation
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/mcpe_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/pink-dimond-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/20210-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-spin-coin-master-link-download_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_off000033a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33A4 22724 bytes
SHA-256: fa281550b378691fa953005ac1ccbbdc0aa9c21aaa9389a6337d0457a40cb159
font_01_sfnt_off0000667a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 19020 bytes
SHA-256: c4929e2cccccb6c645c3e246f213aba1e3fbbbd784ea000777d464120741ffc0

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