Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a9464a9a1d85eb…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 06:11:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ed4ed0f912d3ead438807ea06588623e SHA-1: e30214b4067aec7e00a15d00f03dbba4570ad014 SHA-256: b6a9464a9a1d85eb6b2d0624c208dc78062e7032d96d2a94275a17d16cfdef30
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically targeting users interested in game hacks and generators. The document body and embedded URLs point to a primary redirector URL, http://netcdn.tw/app/431946152/how-to-change-your-username-on-roblox-for-free-game-hack, which is associated with known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/how-to-change-your-username-on-roblox-for-free-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/legit-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/como-hackear-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-hacks-counterbloxrobloxofensibe_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/help-my-roblox-account-got-hacked-and-dosent-have-security_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/robux-hack-no-password_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/if-you-have-builders-club-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-robux-gratis-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/robux-cheat-android_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-executor-free-download_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_off00002f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F71 22516 bytes
SHA-256: 9354c2d721912b20f06ce7519753c7ba430a92b8c87e0db1decbef9edf2d3d88
font_01_sfnt_off000061cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CF 19540 bytes
SHA-256: 13561b44f61144c121be84d59be9fad9902bdfea6fe0fd721d4b8ce19c369a19

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