Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6a46897d8890ca…

MALICIOUS

PDF

45.7 KB Created: 2021-06-08 17:47:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3f9cea151f9d4a7636bef669ca17c121 SHA-1: dfad6aacda65464c3695f2cef06b06f997c991e9 SHA-256: ef6a46897d8890caeeb81c93a45fe368ba3237fd133a91760300e1c44fe44a47
200 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users into clicking on them, impersonating Microsoft to gain trust. These links redirect to malicious infrastructure, likely to host further malicious content or phishing pages. The ML classifier also flagged this PDF as malicious, supporting the observed redirection and lure techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-robux-100-real-no-survey-game-hack.
  • 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
  • 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.tw/app/431946152/free-robux-100-real-no-survey-game-hack In PDF document text
    • http://baroque1990.com/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://baroque1990.com/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://baroque1990.com/images/free-robux_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://baroque1990.com/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://baroque1990.com/images/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://baroque1990.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://baroque1990.com/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://baroque1990.com/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://baroque1990.com/images/how-to-hack-a-roblox-account-2021_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_004_off0000506d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x506D 26716 bytes
SHA-256: 797d0243175beec9a99082dcbd37de9f74cc22a3ad2e91aaa3cf86a7a64101fb
font_01_sfnt_off00008e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E05 18888 bytes
SHA-256: 96a356e712a53382bc595b9d306ddc96e4891da11f225e088dee6859d983c049

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