Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d931e0ff530d98…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 20:34:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ac92a7ddc85962115df9efeba942c341 SHA-1: 851b32721a98b94c9e38f0fbe586201f0233b68c SHA-256: 90d931e0ff530d98a939b4bc87bfb8ef1311f1bb34fcb8f2c817bc24e6fafca2
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 0.9980

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/406889139/coin-master-card-hack-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-exploits-on-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-roblox-gsmes_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-live-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-hacks-in-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-roblox-bots-roblox-games_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-robux-free-without-human-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-hack-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-hack-any-items-free-roblox_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_off000030a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A7 22868 bytes
SHA-256: 938b76f4ea9b0a1db3e8c68efc89408fcfe542bb903515759c14b56cc6cb2a78
font_01_sfnt_off000063d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 18180 bytes
SHA-256: 6f4994608566ebd9397f6cc175ec3337bd2a095019109335e6b17d055b146122

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