Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0c6516cb9a0132…

MALICIOUS

PDF

40.9 KB Created: 2021-05-13 00:03:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 63e602920e2696d14f06b7c8a4612beb SHA-1: 7194a302b95b60d608af1811dc1e1c99d7492c28 SHA-256: 0b0c6516cb9a0132a051c6be66a1631a29882f63f679a098047aab629fed824d
122 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to entice users into clicking a link for game hacks, specifically 'free Robux'. This link, 'https://netcdn.xyz/app/431946152/free-robux-co-game-hack', redirects to a malicious domain. The document's structure and embedded links suggest it is designed to exploit user interest in in-game currency and cheats to deliver a secondary payload or lead them to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-co-game-hack PDF link annotation
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/claim-roblox_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
stream_003_off000046fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46FC 24756 bytes
SHA-256: ef3974c699bc201da4b9d2355ecd3838201b1d08fd8fd08922613e50e8bf68a6
font_01_sfnt_off00007e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E63 18012 bytes
SHA-256: 3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360

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