Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6eb21cf22381a4…

MALICIOUS

PDF

35.6 KB Created: 2021-06-26 16:44:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1edca887ffa9a835581f807eb8149314 SHA-1: 8036a2a92f0cf9351d1a570cbac77237e2e0eb1f SHA-256: 3f6eb21cf22381a4c955b22abfbe43b4a74ce6cc68a0431d64d8e6312ddc51e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link that redirects to malicious infrastructure, masquerading as a free generator for games like Robux and Coin Master. This lure is designed to trick users into visiting potentially harmful websites. The ML classifier also strongly indicated maliciousness.

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/free-robux-generator-no-survey-no-hack-game-hack In PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/worst-client_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-monster_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/como-ganar-robux-gratis-sin-hacks_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/roblox-free-admin-exploit_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/mcpe-download_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/free-roblox-gift-card-codes-2021-march_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/roblox-free-domino-crown-promo-code_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-use-hacks-on-roblox-pet-sim-2_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/howto-get-free-robux-without-survey-and-verification_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_off0000331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x331C 22552 bytes
SHA-256: d82dcef329287916661d961ad1395b23f240121a110a1a62c33b760296922025
font_01_sfnt_off0000658b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 19284 bytes
SHA-256: 06d05da876a96b92d5b358d023ffc6f71b24758a20cadc4ba74d2ef55260a005

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