Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb479f4695e8135…

MALICIOUS

PDF

51.2 KB Created: 2021-06-09 14:48:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2ec43ca3adb6e8c30aaaee1359546fae SHA-1: a2d781d4c8b76bddc3825b0ae1a9e0df9ef8fe5d SHA-256: 5cb479f4695e813585a6fe731e888c1f1a665bc38a536375a2a4064bb9e39268
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also features a large number of external links, many of which point to SEO-optimized PDF files hosted on suspicious domains. These links likely lead to scam pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-hack-without-verification-2021-game-hack
    • http://zarinnameh.ir/images/robux-free-co_GM431946152.pdf
    • http://zarinnameh.ir/images/coin-master-hack-2021-without-human-verification_GM406889139.pdf
    • http://zarinnameh.ir/images/how-to-get-2021-robux-for-free_GM431946152.pdf
    • http://zarinnameh.ir/images/can-u-get-free-robux_GM431946152.pdf
    • http://zarinnameh.ir/images/free-minecraft-worlds_GM479516143.pdf
    • http://zarinnameh.ir/images/free-robux-roblox-promo-codes_GM431946152.pdf
    • http://zarinnameh.ir/images/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://zarinnameh.ir/images/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdf
    • http://zarinnameh.ir/images/how-do-i-get-free-coins-on-coin-master_GM406889139.pdf
    • http://zarinnameh.ir/images/spin-free-coin-master_GM406889139.pdf
    • http://zarinnameh.ir/images/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://zarinnameh.ir/images/moonactive-free-spins-coin-master_GM406889139.pdf
    • http://zarinnameh.ir/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
    • http://zarinnameh.ir/images/minecraft-for-ipad-free_GM479516143.pdf
    • http://zarinnameh.ir/images/op-rewards-free-robux_GM431946152.pdf
    • http://zarinnameh.ir/images/robux-fun-hack_GM431946152.pdf
    • http://zarinnameh.ir/images/how-do-you-hack-roblox_GM431946152.pdf
    • http://zarinnameh.ir/images/coin-master-free-link-today_GM406889139.pdf
    • http://zarinnameh.ir/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdf
    • http://zarinnameh.ir/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d7.bin
19599b6dba2524d2d1edfb1eea5c511d92e1cbdfd12a43ece8d84c74f0680433		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D7 35932 bytes
font_01_sfnt_off0000a280.bin
ec74b18cfde316dc0cd9aefc16882ec961bad79a5996aa86c904c0168c58b4df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA280 19444 bytes

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