Malicious PDF — malware analysis report

Static analysis result for SHA-256 c718ec8053b21423…

MALICIOUS

PDF

35.5 KB Created: 2021-06-30 10:27:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e23cc691fb1664c92b4d03878089e067 SHA-1: e3031ac732a1a6410860d7628a0d53eb254ea6f6 SHA-256: c718ec8053b21423c102123812baa5bfe9efa0514267e02fb56688a6370f43a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector URL, masquerading as a 'free generator / game hack'. The document body explicitly mentions 'how to get free Robux 2021 hack', reinforcing the lure. The presence of embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt, likely leading to further malicious content or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.co/app/431946152/how-to-get-free-robux-2021-hack-no-subscribing-game-hack In PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-a-free-knive-in-roblox-cbro_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/is-there-a-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-accounts-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/btools-hack-in-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/master-coin-free_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-accounts-roblox-2021-september-2021-live_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307B 23000 bytes
SHA-256: 917010a2f689b0d95f7c997230c0c4a7a295442362c71b8330a13cd926c75ea0
font_01_sfnt_off000063f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F7 19676 bytes
SHA-256: f38f31669cce76db434a27d5e4e3a7826c040e4d3e6017160357957e761ebd66

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