Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21ac290ad572a50…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 07:51:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf44d5102ff7fcac36a936b10fb72c3e SHA-1: 96521a02526aef04d822552a539b8d3dc0cc96b1 SHA-256: f21ac290ad572a509660af925a29a7293b81b64b14b3626bed8415ff21e148a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising game hacks and currency generators for popular games like Coin Master and Roblox. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms these links point to known malicious infrastructure. The document body and extracted URLs suggest a phishing or scam attempt designed to lure users into clicking malicious links, likely leading to further malware downloads or credential harvesting.

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.tw/app/406889139/coin-master-claim-spins-game-hack In PDF document text
    • http://gazelletr.com/userfiles/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/como-hackear-cuentas-de-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/mcpe-client_GM479516143.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/roblox-free-robux-cheat-2021_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/roblox-person_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-roblox-combos_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/roblox-robux-hack-no-survey-no-offers_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/walking-trhought-wall-cheat-engine-meme-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://gazelletr.com/userfiles/files/como-conseguir-robux-gratis-hack-2021_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_off00002f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1A 22300 bytes
SHA-256: ca3b4bf42f4345b6cac37a7d1cc62d09fd588f573c56443f3b851d26676be678
font_01_sfnt_off000060a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 18344 bytes
SHA-256: d8cccda057f64c947ab6ae0a87057660c374c9b091fe16e0f35107dc7c5d8ca5

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