Malicious PDF — malware analysis report

Static analysis result for SHA-256 603deff00909a605…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 03:05:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2fedf23fb342de6bf5fe2a947091eecc SHA-1: 07c3736b2acc8c0279a0a86bcd5838a33e4d5efb SHA-256: 603deff00909a605f439877caadba14cfe37401d44932fbcd3bc6b500226cc42
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/835599320/tiktok-ui-kit-free-game-hack PDF link annotation
    • http://elibrary.smknesbu.sch.id/repository/free-robux-nicsterv_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-polygun-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-roblox-money-on-ipad_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-accounts-to-use_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-on-computer-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/spiderman-stuff-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/dbor-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/como-hackear-roblox-robux-gratis_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-hack-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/loki-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/youtube-live-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/adidas-tracksuit-roblox-for-free_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_off00002f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7D 22144 bytes
SHA-256: 3e27863364ac3051933b6703627e8d3fb937e5d700fc3a22054370019ae36c84
font_01_sfnt_off00006081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6081 18160 bytes
SHA-256: de860804afc91ab6fe25047026e6a860946fd706175849b4e4b793387d7e612c

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