Malicious PDF — malware analysis report

Static analysis result for SHA-256 991c53191431ede5…

MALICIOUS

PDF

35.0 KB Created: 2021-06-20 13:46:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5d989b70ea2ec544e49f18fbf22f3be7 SHA-1: 265d720fcdfda447bec6d6f828737922b608e5cc SHA-256: 991c53191431ede56c9b14f9e12e3ddb2b10952612bfe9bb89edc3f2f36fc1f7
160 Risk Score

Malware Insights

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

This PDF document employs a lure for game hacks and generators, directing users to a known malicious redirector. The document's structure and embedded URLs suggest an attempt to trick users into downloading potentially malicious files or visiting further compromised sites. The ML classifier strongly supports the malicious nature of this PDF.

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/roblox-tower-battle-hack-script-game-hack In PDF document text
    • http://cornerwebstudio.com/images/fast-robux-free_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/roblox-adopt-and-raise-a-kid-free_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-change-your-speed-no-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/hack-para-trials-simon-says-roblox_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/new-roblox-jailbreak-hack-exploit-walkspeed-noclip-gravity-and-more_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/roblox-pokemon-brick-bronze-hack-script_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-spin-in-coin-master_GM406889139.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_off00002fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA8 22860 bytes
SHA-256: 19c6ce16bd52b9bb184d10a69017f368fbcffa12ba98a26e1fc785986de7bf34
font_01_sfnt_off0000634d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 19220 bytes
SHA-256: 1af6ff917d935f666bcfbb950e4792fd05d51d2907fafa090751489e22374613

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