Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6d5ce5d9ce3652…

MALICIOUS

PDF

48.0 KB Created: 2021-06-08 21:37:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9d0ff1dcf6d64393fcf468e70467e6ab SHA-1: cc73656d0183853a34ffdc92e754e950de724ad1 SHA-256: 9b6d5ce5d9ce365202731f1cc0cc526a21d93649082aed260cf6339d9b331e32
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' to entice users into clicking a link. The link, 'https://netcdn.tw/app/431946152/free-robux-pins-2021-game-hack', redirects to a malicious website, likely to deliver a secondary payload or phish for credentials. While no scripts were explicitly extracted, the PDF structure and heuristics indicate malicious intent, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-pins-2021-game-hack PDF link annotation
    • https://vstarnippers.com/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • https://vstarnippers.com/images/roblox-snyapse-free_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/free-roblox-printables_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/cheat-roblox-restaurant-tycoon_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/minecraft-esp_GM479516143.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vstarnippers.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://vstarnippers.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B6 26348 bytes
SHA-256: fe35f964dce59bcfd3da2bd596376774335fc4ca9f680782fa393a96edac5ce6
font_01_sfnt_off00008e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0A 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off000097aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AA 18692 bytes
SHA-256: a86d2ec886c7a2ac77876fa5528875730ef0c2c1fa5daaad5b65c7772cb92675

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