Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d7b2cc2a659036…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 12:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: acd331a0aaef471e7b30aa2ad134f853 SHA-1: ac828942ad72cffce5e568c447d6fe9eae51d39d SHA-256: 91d7b2cc2a65903621c8e0d44d0390f2810e7adf39962dd8a831eca76dbdfdce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to websites that promise game hacks and free in-game currency, such as Robux. The primary external URI points to 'http://netcdn.tw/app/431946152/how-to-hack-roblox-2021-game-hack', which is highly indicative of a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with a high probability. No scripts were extracted, but the embedded URLs and document content strongly suggest a social engineering lure.

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-hack-roblox-2021-game-hack In PDF document text
    • https://www.harfa.hr/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.harfa.hr/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://www.harfa.hr/files/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.harfa.hr/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.harfa.hr/files/bloxpage-free-robux_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_off00002e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E17 22388 bytes
SHA-256: 4fc852db247b83893122b79f9d621ab7c8e27fdb70d9420e068672b4edf0db25
font_01_sfnt_off00005ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 19224 bytes
SHA-256: 952aa56c448a3876108b271681fe1a59f9d49131b8b4cd095e69c290d9073af5

Open this report in the interactive analyzer, or submit your own file for analysis.