Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a49475556d3499f…

MALICIOUS

PDF

33.5 KB Created: 2021-07-03 23:05:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2ec11562b265d211e1243ac92f9817c1 SHA-1: 2c8c52ac9bed0d62dec0b8de05de1dabad66677b SHA-256: 8a49475556d3499f743e8efae8fb6dcecd73742bfe02bbb8275ab1eac3d39a0b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including a prominent one to 'netcdn.tw/app/431946152/how-to-get-robux-easy-game-hack', which is flagged as a game hack redirector lure. The document body also contains similar lures and a call-to-action phrase, suggesting the intent is to trick the user into visiting a potentially malicious site to obtain game-related cheats or currency. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/how-to-get-robux-easy-game-hack PDF link annotation
    • https://delsys.com.tw/image/data/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/get-more-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-console-hack-2021_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roiblox-free-robux-cards_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-do-you-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-bloxburg-hack_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
stream_001_off00002a7d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A7D 22940 bytes
SHA-256: b6c11d66c17436b3956cf4eeb23000a7de80535e6c3912e47b6b80471c2046f5
font_01_sfnt_off00005dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFC 19000 bytes
SHA-256: 9c8ff038a449ab176a5e1d1aada010ae8dcfba4f01e2557d9a848b5c6737e1f5

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