Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a8a44ae40891a7…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 16:21:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e57c1a36e1eeb9803bb995d40c7abdf1 SHA-1: 919561f7f542258db91c3d4516254a30722a5e40 SHA-256: 37a8a44ae40891a77dac300297e5ba5c4fc79490476232980cc8b2c8180c7de7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links designed to lure users into clicking on promises of game hacks and free currency, such as for Roblox. The primary link, http://netcdn.tw/app/431946152/hack-roblox-players-game-hack, is identified as a redirector. The document also functions as a link farm, pointing to many other PDF files hosted on lib.fisipumt.ac.id, suggesting a coordinated effort to distribute malicious links. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/hack-roblox-players-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/www-roblox-com-cheat-in-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-2021-fastest-and-easyest-way_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-no-human-verification-on-pc_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-without-verification-2021-april_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-copy-and-paste_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-blox-piece-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-lumber-tycoon-cheat-money_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-hack-free-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-blogspot_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_off00002ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF8 21912 bytes
SHA-256: cf4e2a618d769399c9aa69687d805226b475730c84a20f1d00b38bd1cc23d648
font_01_sfnt_off00005f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 18992 bytes
SHA-256: c8ece8e41cb02cb390b78a7de8842534a538b51bc12e46e9414b78277a363219

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