Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c6438af9f4716b…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 12:45:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4799eadb85305f9430b202cc6ca608e4 SHA-1: 163ff7cd4e0d4ef3a5e1eb50655e2a56bacf1cb0 SHA-256: b4c6438af9f4716b470fff6087106c4dde93c13afd7ec4a9022753b46839eab7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary malicious URL identified is http://netcdn.co/app/431946152/chat-hack-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

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/chat-hack-roblox-game-hack In PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/free-robux-codes-november-2021_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/tiktok-free-generator_GM835599320.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/assassin-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/change-your-name-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/hack-nuevo-para-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/free-robux-xbox-one_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/how-to-speed-hack-in-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/free-robux-no-survey-easy_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.qandqsafety.com/uploaded_files/userfiles/files/free-robux-no-survey-or-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

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_off0000316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316E 22468 bytes
SHA-256: b3c006eb1334af24e253357cb721d67a91b6690c6cf934d95399832ca914dcdf
font_01_sfnt_off00006375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 18928 bytes
SHA-256: 6468859b8ff5cdaf79237b38cfa37252f0c6373277018d8572235db4748fe78a

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