Malicious PDF — malware analysis report

Static analysis result for SHA-256 612e904ab0514d5e…

MALICIOUS

PDF

33.1 KB Created: 2021-06-27 05:01:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c82ef667f6aa2a533bb2af5e7d567e21 SHA-1: 8af2fc0ce10e3c4a47b5662cc31db4202c6e067c SHA-256: 612e904ab0514d5eefdee810ea668fa62be94477e06dc0e7fb1d199d8d451f23
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and text that promote free game hacks and generators, specifically mentioning Roblox and Coin Master. These links direct to a known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the overall pattern suggests a phishing lure to a malicious 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/how-to-get-the-roblox-madness-face-for-free-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-roblox-admin-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-group-funds-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-anti-bot-verification_GM431946152.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_off00002dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFC 20900 bytes
SHA-256: 7cabdebd3effeb677af2588ca33ec52a936cd2af02f9613d371ce39540d3ab7f
font_01_sfnt_off00005b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1A 19452 bytes
SHA-256: f55ed5bfae5b6a8632178f615b907b2fa3d3de68527c6d90930da0185a653584

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