Malicious PDF — malware analysis report

Static analysis result for SHA-256 249fcfb7f5d9f1b9…

MALICIOUS

PDF

47.5 KB Created: 2021-06-02 20:11:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6acb210a025b803cb4736dae5aab874a SHA-1: 854923f8ce9f3b4c332efeb25f671c0dc7e629e4 SHA-256: 249fcfb7f5d9f1b9619274f477a33812e6099475fbca78b28e5f2fa03cce6095
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The document body and heuristic firings confirm the presence of malicious redirector links and a lure for free game currency. The primary malicious link identified is https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-2021-game-hack, which is designed to deceive users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-2021-game-hack In PDF document text
    • http://zarinnameh.ir/images/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-pics_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-roebucks_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-map_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-free-coins-and-spins-app_GM406889139.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_off00005099.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5099 25160 bytes
SHA-256: a5860cbb9b68eeec0933296f925316808218f50978d06f84fc67fdbf70b426b3
font_01_sfnt_off00008a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8C 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00009488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9488 19016 bytes
SHA-256: 7afc4835c6f8d200a546e15f78f642ba5dd88c8fac7df04bc3003dd1e9f7232a

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