Malicious PDF — malware analysis report

Static analysis result for SHA-256 1135775f65351685…

MALICIOUS

PDF

45.5 KB Created: 2021-06-07 03:14:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9acb418dd6ff51875a9432dba45da951 SHA-1: 27386a8304b8813937c0978d33d0b8880c52243f SHA-256: 1135775f653516853ebc8842b35fea0e039a39dd63e3cd8c5376dea8df2d5cfa
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA, indicating a phishing or scam attempt. The primary link, https://netcdn.tw/app/431946152/how-to-get-free-robux-hack-2021-no-verification-game-hack, is associated with a 'free generator / game hack' lure. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest it's designed to trick users into executing further malicious actions or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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
  • 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.tw/app/431946152/how-to-get-free-robux-hack-2021-no-verification-game-hack In PDF document text
    • http://www.rezbb.sk/images/pubg-uc-earning-app-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://www.rezbb.sk/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.rezbb.sk/images/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://www.rezbb.sk/images/edit-roblox-game-code-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://www.rezbb.sk/images/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://www.rezbb.sk/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/pokemon-go-free-0-iv_GM1094591345.pdfIn PDF document text
    • http://www.rezbb.sk/images/get-free-spins-coin-master-2021_GM406889139.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_off0000518b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x518B 25600 bytes
SHA-256: b6679020f7a66e13f3a8577fbb198fbdf80e2dc50ffe0ef0af0285f6d1a2770d
font_01_sfnt_off00008c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C13 19336 bytes
SHA-256: 6a2965ddf23b1c470bc839855f282a709b8aaa0882e953298d752cd8b3ce83e0

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