Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd47a93b6a4b67c…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 11:40:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 16e8641b750663f1b855c5fcb4a8cf4b SHA-1: af36c90d43121bac2828543491f480166bc3563b SHA-256: ecd47a93b6a4b67c68371b038d0addcfba49698e4b1aef9e3afdf42a63633086
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a call-to-action phrase designed to lure users into clicking on a URL that leads to malicious redirector infrastructure. The primary lure is related to 'free Robux' or game hacks, indicating a social engineering tactic to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt.

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-get-robux-game-hack In PDF document text
    • https://opac.heritagejkt.org//repository/free-100-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-roblox-generatorcom-pc_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-no-verification-no-email_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/framed-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/code-from-roblox-new-cheat-halloween-simulator_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-screensaver-free_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/game-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-roblox-hats-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-does-people-uses-hacks-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-roblox-account-username-and-password_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-live_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_off00002ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECD 22560 bytes
SHA-256: 64c93133208671b451d52471887a5c8d5899746aa32a7dad0fc9ad44dfc89051
font_01_sfnt_off00006149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 18820 bytes
SHA-256: a2dfb2a65560055ec751139d067554c48d03732db01303c3495e5b92c6b8973a

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