Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7a4b8cf0b2ec7a…

MALICIOUS

PDF

34.8 KB Created: 2021-06-29 06:24:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eed2ad886af47013c6d9616982843b14 SHA-1: 2ef15c62c8db8e4a5346161e311ced171a44fe28 SHA-256: ef7a4b8cf0b2ec7a801a8ad4d63ccd7cbef9e04ac41acc17a3431304781adf4f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for free in-game currency and hacks, directing users to the URL http://netcdn.co/app/431946152/free-robux-givaways-game-hack. This URL is flagged as a known malicious redirector. The presence of a visual download button and the ML classifier further support the malicious nature of this document, likely intended to deliver a secondary payload or lead to a phishing site.

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/free-robux-givaways-game-hack In PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/hack-roblox-dragon-ball-final-stand_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/unblocked-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-hack-roblox-files_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/pubg-uc-hilesi_GM1330123889.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-for-kids-no-vertification_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/robux-now_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/roblox-afk-saber-simulator-hack_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/exploits-for-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/robux-hack-no-human-verification-pc_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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_off00002f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F75 22852 bytes
SHA-256: 19a6b22c4a77d6ccd9526227396d3a909d37384bb40313f21da90c2203cf425d
font_01_sfnt_off0000622b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 19296 bytes
SHA-256: bc07b351ca7f7116edf956dd94571e994b81e6a98a73bfa25aa9cc76189c7f65

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