Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18bce9ee318715f…

MALICIOUS

PDF

41.4 KB Created: 2021-05-10 16:33:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 03fc1ece32afff6a5f3d3aa2253f8674 SHA-1: 9156b8fb0839c32f797ae5c213daf8608825a47e SHA-256: a18bce9ee318715f692bfddeb8cb823d0fa378685956b6fc733d10b8e11c966f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-game-free-download-game-hack PDF link annotation
    • https://delsys.com.tw/image/data/files/robux-converter_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/rbx-hut_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-coin-and-spin-app_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/robux-place-rewards_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/get-coin-master-cards-free_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
stream_003_off00004706.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4706 25004 bytes
SHA-256: 83c0bec53164b486cf17310ed3a2fcc26d1849194d1f2b3985718bdcede7a6aa
font_01_sfnt_off00007e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E90 18548 bytes
SHA-256: a0a0c8e1d18cb0b2c4d70870d3dfc55de425b9372d4c2a3baebf4bcbef941d80

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