Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1951a9f8e6f274c…

MALICIOUS

PDF

47.7 KB Created: 2021-06-02 16:58:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7777feb4eb03932a74f7589827dd8a94 SHA-1: dd3a49a1df7daad1fa8d47e797afbfade43bd5d9 SHA-256: e1951a9f8e6f274c4b67f2c916dc1bc64f177fae8e48b99e1e3b590f08e07cf5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and currency to entice users. It contains multiple links to redirectors, including a critical finding pointing to known malicious infrastructure at `https://netcdn.xyz/app/431946152/free-robux-legit-2021-game-hack`. The document body, though partially corrupted, contains similar lure text and URLs, reinforcing the malicious intent. No scripts were extracted, but the presence of multiple malicious links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.xyz/app/431946152/free-robux-legit-2021-game-hack In PDF document text
    • http://zercalo.org/images/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-highschool-money_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f4d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F4D 24696 bytes
SHA-256: bdf0eceb7082dcd451f3021156f4c82112df485174fa71d0dece082205cf5402
font_01_sfnt_off00008848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8848 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off0000956f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x956F 18928 bytes
SHA-256: 4fcc659f6218715f516ca63f911a9aa4b2bc62ab7ad3ebfb6481473152e27863

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